Yesterday, the Fanboy list started blocking the CSS sprite image used on the Stack Exchange network (Stack Overflow, etc.) because of its name starting with [i]share-sprite[/i].

Apparently today there was a whitelist rule added for Stack Overflow, but the rest of the network is still affected.

See http://meta.stackoverflow.com/questions/225831/image-of-stack-exchange-button-is-blocked-by-adblock for information and http://meta.stackoverflow.com/questions/90230/how-do-i-show-ads-on-trilogy-and-stack-exchange-sites-with-adblock-enabled/ for the sites that should currently be whitelisted.