Full screen pop up ads, that come up randomly. Do I have adware?

I've done everything to prevent pop ups from coming up. Even downloaded the program "Glimmerblocker" to block even more pop ups then just safari can do normally.

These pop ups I've been getting take up my whole screen. It pops up, and directs to like 3 different websites before stopping on a certain ad. It is the same kind of pop up and it happens on different sites. Even popular sites like digg.com, it would pop up when I try to log in to digg. They only pop up after I click something, but at random though.

Anyone have similar pop ups, and know what to do? I did some research and I read that there's some kind of adware for mac out there. I tried running the mac antivirus program "MacScan 2", but it found nothing but some cookies. I am updated to the latest security updates.

Any help is appreciated.