@Jeffro

I did not have real high hopes for this page, but stand pleasantly corrected. ;)

When I looked, the top comment showing (also on Jeffro's link), begins:I've suffered from the same malware issue earlier. Since we use ad networks for advertising it works as follows. 1 ad network has about 3000 different ads running in different locations. If any of those domains get compromised and blacklisted and Google notices that you served something from that domain - BOOM! - [emph. added]

This reinforces the remark I made to Tom Gasville, that having yourself 'all networked up' with gawd-knows who-all & what-all, means that when any one of your network partners does something squirrelly, shady, too-rule-bendy or downright nefarious ... the whole dang bunch of you are taking the fall!.

It's not just "ads". It's not just "image-linking". ANYTHING too far outa the envelop, on any of potentially huge numbers of sites, involving linkages that may be totally unknown to many of them, can become a problem for all of them.

This is what appears to have happened to WP-ABTesting.