False Positives getting to be annoying

I’ve gotten false positives on sites like CNet, Huffington Post, MSNBC and now on my own blog when I was testing a hyperlink. It says it’s because of a Twitter button that has been on that site for over a year and never been detected as malware before. All the false positives are for some sort of ad on each site, but it’s highly unlikely that ALL of these reputable sites would be trying to install malware. The latest one says it’s via Firefox Portable, but I am not using FF portable. Please help!

If you could post a couple of the images of what you are referring to as FP’s it would be helpful