hacker news vs. slashdot—reputation systems in crowdsourced technology news
DESCRIPTION
Comparing the reputation systems of Slashdot (slashdot.org) and Hacker News (news.ycombinator.com), highligting details and presenting possible changes. Christoph Matthies (@chrima0), Robert Lehmann (@rlehmann)TRANSCRIPT
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Hacker News vs.
SlashdotReputation Systems in
Crowdsourced Technology News
Robert Lehmann, Christoph Matthies(@rlehmann) (@chrisma0)
Nov 2012
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2011 2012
1000
2000
3000
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Slashdot
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Slashdot users
alexa.com, Nov 25th 2012
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$ $
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+1, Insightful
Unfair
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+1, Insightful
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“■
■
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Unfair
+1, Insightful
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+1 / -1
Unfair
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○○○○
-10 -1 0 12 25
Defaults in Slash CMS (slashcode/sql/mysql/defaults.sql)
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Hacker News
If you apply for YC and get rejected, pg [Paul Graham] may follow-up with an explanation just because you have a high score.
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Hacker News users
alexa.com, Nov 25th 2012
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“Anything that good hackers would find interesting.That includes more than hacking and startups.
If you had to reduce it to a sentence, the answer might be:anything that gratifies one's intellectual curiosity.
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UpvotesUpvotes
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no duplicate votesonce you have voted
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kinda bookmarks
not only endorsements
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scale
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rewards
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reportreply flag
inappropriate content
(spam or offtopic, for stories too)
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pollsnew story type:
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top color change(yay! \o/)
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downvotes for comments only
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comment score below zero
(def comment-color (c) (if (> c!score 0) black (grayrange c!score)))
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Community Nature
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Four design goals for distributed moderation systems
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Four design goals for distributed moderation systems
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Four design goals for distributed moderation systems
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Four design goals for distributed moderation systems
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Four design goals for distributed moderation systems
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Effectiveness of metamoderation on Slashdot
Metamoderation's agreement with fairness of moderation
% of moderationsreversed
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Other considerations
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Other considerations
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Other considerations
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Other considerations
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Other considerations
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political discussion
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buried treasures
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Is this a problem?
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Metamoderation's agreement with fairness of moderation
% of moderationsreversed
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How? Attention Deficit
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30%29%25%
9%
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How? Attention Deficit
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X II
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X II
How? Attention Deficit
X II
⅕
⅕
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How? Information Cascade Effect
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explicitly visible comment scores
Information Cascade Effect
+3, Insightful
as applicable to Slashdot
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Remember, though
All these effects don't have to be negative.
e.g. Information Cascade Effect can strengthen good comments and further demote bad ones.
Remember, though
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Lampe’s Solution [1]
Adjust the damn comment filter.
most recent
visible
hidden
recently written recently moderated
afte
r
bef
ore
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The four design goals in Lampe’s proposal
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Lampe’s Solutionas applied to Hacker News
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Power to the people M2
*
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Encourage constant greatness
*
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protection mechanisms
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(def vote-for (user i (o dir 'up))
(unless (or ((votes user) i!id)
(and (~live i) (isnt user i!by)))
(withs (ip (logins* user)
vote (list (seconds) ip user dir i!score))
(unless (or (and (or (ignored user) (check-key user 'novote))
(isnt user i!by))
(and (is dir 'down)
(~editor user)
(or (check-key user 'nodowns)
(> (downvote-ratio user) downvote-ratio-limit*)
; prevention of karma-bombing
(just-downvoted user i!by)))
(and (~legit-user user)
(isnt user i!by)
(find [is (cadr _) ip] i!votes))
(and (isnt i!type 'pollopt)
(biased-voter i vote)))
(++ i!score (case dir up 1 down -1))
cheating, the secret sauce
● karma bombing prevention○ prevent cabal against individual users
● downvote ratio○ cannot cast too many downvotes
● sockpuppet protection
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if ($constants->{comments_portscan} && ( $constants->{comments_portscan} == 2 || $constants->{comments_portscan} == 1 && $user->{is_anon} ) ) { my $is_trusted = $slashdb->checkAL2($user->{srcids}, 'trusted'); if (!$is_trusted) { my $is_proxy = $slashdb->checkForOpenProxy($user->{hostip}); if ($is_proxy) { $$error_message = getError('open proxy', { unencoded_ip => $ENV{REMOTE_ADDR}, port => $is_proxy, }); $form_success = 0; return; } } }
● HTTP Proxy● maximum number of posts per day● "trollishness"
○ half-lived amount of downvotes● compresses too well (with Zlib)
○ ASCII art"nobody should be using that many wide characters in the Standard English alphabet"
Anonymous Cowards punished harder.
and now a word from CmdrTacorigorous checks for legit posts
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if ($constants->{comments_portscan} && ( $constants->{comments_portscan} == 2 || $constants->{comments_portscan} == 1 && $user->{is_anon} ) ) { my $is_trusted = $slashdb->checkAL2($user->{srcids}, 'trusted'); if (!$is_trusted) { my $is_proxy = $slashdb->checkForOpenProxy($user->{hostip}); if ($is_proxy) { $$error_message = getError('open proxy', { unencoded_ip => $ENV{REMOTE_ADDR}, port => $is_proxy, }); $form_success = 0; return; } } }
and now a word from CmdrTaco
● 7 whitespaces in the subjectlots of space in the subject ... lots of space in the head.
● more than one characterone character. Hmmm. Gee, might this be a troll?
● words longer than 80 lettersthat's an awful long string of letters there!
● 50% capsPLEASE DON'T USE SO MANY CAPS. USING CAPS IS LIKE YELLING!
● "feces", "goatse.cx"too smelly to submit
rigorous filters for legit posts
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banhammer
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● Karma: Terrible (-10)● default comment
score of -1● set all comment
scores to Offtopic (-1)
● Karma: Terrible (-10)● revoke all
moderation points
warning if a user has more than 10 KarmaUse -f to forcibly slap
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nukeblast blastban the site+kill submission
ban user+
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hellbanninghellbanning●
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“a hellbanned user is likely to get bored or frustrated and leave [...]the silent treatment is the cruelest punishment of them all. [1]
— Jeff Atwood
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Backup slides
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General cheating (this always works)
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Gaming the System●
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“
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unless ($opts{'f'}) { die <<ERR if $user->{karma} > 10;User $_ has a karma of $user->{karma}. Slap aborted. Use -f to forcibly slap.ERR} print "Bitch Slapping #$_...\n";print "Karma Reduced\n";print "Default Score Reduced\n";$slashdb->setUser($_, { -karma => $constants->{badkarma}, -defaultpoints => -1,});
print "ALL live comments moderated down\n\n";$slashdb->sqlDo("UPDATE comments SET points=-1,reason=1 WHERE uid=$_");
Exhibit A — source of bitchslap (Slashdot)
![Page 87: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/87.jpg)
Moderation adjectives
![Page 88: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/88.jpg)
Tweaking options on Slashdot
![Page 89: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/89.jpg)
Basic Social Media
![Page 90: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/90.jpg)
Submit-Publish
![Page 91: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/91.jpg)
Slashdot submission overview
![Page 92: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/92.jpg)
Hacker News submission overview
![Page 93: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/93.jpg)
Comment overview on Slashdot
![Page 94: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/94.jpg)
Hacker News comment overview
![Page 95: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/95.jpg)
![Page 96: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/96.jpg)
![Page 97: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/97.jpg)
![Page 98: Hacker News vs. Slashdot—Reputation Systems in Crowdsourced Technology News](https://reader033.vdocuments.us/reader033/viewer/2022051323/547958025906b58a048b468d/html5/thumbnails/98.jpg)
Distribution of comment scores on Slashdot