Hi there I am looking for help identifying a possible form of adware on my Macbook Pro. I'm not sure if this is something that everyone has, but seeing as it's only appeared recently it makes me think that I've downloaded something I shouldn't have. I've been told time and again that Mac's cannot get viruses and the like, but I believe mine has contracted some form of adware or other advertising encryption. Below are a few screenshots of the ads on Facebook using Safari (with AdBlocker) and Wikipedia on both on Safari (with AdBlocker) and Firefox (without any ad remover extension). Sorry for the size, couldn't work out how to resize: It appears to only affect Facebook, Wikipedia and some search bars on websites. I have had Safari AdBlocker installed for quite a while and has done the trick for hiding all ads, however in the past few days these ads have come back again. It's only this type of advertising, the ones that say "ads not by this site" or "ads not by Facebook", not proper advertisments. I have checked Facebook's advertising methods and they claim that the places in which they are appearing (bottom of the page, on the sidebar ect.) are not them and are most likely some form of adware or malvertising. I have run a few scanning programs such as Clamxav and Sophos Anti-Virus but have not found anything. I'm running OS X v10.6.8 on a mid-2009 MacBook Pro model. First of all - what, if anything, have I got? Is there a file directory most likely to contain an adware or 'of the like' file that I can delete without the need for a full scan? Is there a better scanner to use for Mac's? Can this sort of problem be taken into an apple store to be assessed and for them to fix if I can't find a solution?