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I don't know if this is a bug or a revocation of a privilege or a new approach to advertising, but I am now seeing "leaderboard" ads on SO when previously I was not (I have sufficient reputation for the "Reduce Ads" privilege).

By "leaderboard" I mean the definition given in the "Reduce Ads" privilege - just below the "Stackoverlow" banner for both the main list and in questions.

Here's a screenshot: screenshot of ads

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What are "leaderboard" ads? What exactly are you seeing? Screenshots help. – Oded Jul 31 '13 at 14:22
@Oded screenshot added – Bohemian Jul 31 '13 at 14:30
Nope, not ours. Looks like you got some toolbar / adware there. Could be injected by your ISP? – Oded Jul 31 '13 at 14:31
Could be, but I'm using Chrome and I can't see anything in my tools etc. – Bohemian Jul 31 '13 at 14:35
Hover over that i icon under the ad, next to "Ads Not by This Site" - may tell you what's going on. – Oded Jul 31 '13 at 14:36
Firebug shows the ads are form servedby.adsdumpo.com - stay tuned – Bohemian Jul 31 '13 at 14:38
Super User to the rescue? “Ads not by this site” displayed by ads injected into certain web pages. – Arjan Jul 31 '13 at 14:40
OK I am only getting this for stackoverflow. No other websites have this banner! – Bohemian Jul 31 '13 at 14:42
@Oded Turned out to be a Chrome extension called "Hosts". Don't know how it got there. Nuking it fixed the problem. – Bohemian Jul 31 '13 at 14:47
GR8 - nothing like your friendly adware to ruin the user experience – Oded Jul 31 '13 at 14:48
They are remarkably well targeted and placed. Somebody knows exactly what the SO front page looks like and who visits the site. – Uphill Luge Jul 31 '13 at 20:04

2 Answers 2

Those are not our ads. We've seen this before and it turned out to be a rogue addon inserting ads into the page. Try disabling all plugins / addons and see if it goes away. If not, you may be infected with some adware.

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It actually says below the ad: Ads Not by This Site – Stijn Jul 31 '13 at 14:32
@Stijn - a clue! (well spotted) – Oded Jul 31 '13 at 14:34
Or a really obnoxious ISP that injects ads to their clients. – Oded Jul 31 '13 at 14:38
@Stijn doh! Quite so: Malware. See my answer for what it was. – Bohemian Jul 31 '13 at 15:57

I am using Chrome. The issue was an extension called "Hosts" - nuking it fixed the problem.
I have no idea how it came to be installed.

Note that a cursory use of other sites did not show this problem - it must target certain types of sites only.

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It was installed as result of a virus or legit software that silently added it as well. See here: productforums.google.com/forum/#!topic/chrome/W1ThgbhLPA4 – Shadow Wizard Jul 31 '13 at 14:55
You posted the comment on the wrong answer. :) – Shadow Wizard Jul 31 '13 at 15:20
@ShaWizDowArd No. Deliberate. stijn noticed the "ads not from this site" on the other answer, and I wanted to bring his attention to this answer to show him what the malware was exactlyq – Bohemian Jul 31 '13 at 15:29
@Bohemian - If only @ on comments worked like that. Stijn won't be notified as there is no comment by him/her on this answer. – Oded Jul 31 '13 at 15:54
@Oded thx. I should know that :/ I've never tried cross-notifying before. – Bohemian Jul 31 '13 at 15:57
Do you know of any other plugins that use this? Can you tell me the install path of this plugin? on our firewall their ad pages are one of our mos hit sites, i think we have an infestation – acme64 Jan 17 '14 at 16:58
@acme64 my infection was in the client browser and I fixed it by uninstalling it via the browser. Sorry, I don't know the install path or of other similar plugins. – Bohemian Jan 17 '14 at 20:19

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