Yay they have gone!!!! On digital spy had the same problem and ad blockers did not seem to work for them. It was who ever was supplying the ads, the site owner did not realize they jump up and filled the page.
I get the odd add between the posts which is no problem, it was the bloody moving one jumping from the bottom of the screen and my anti virus pulling me off st.com with a warning!!! Something about fake windows???? The weird thing is I am on Firefox and ad blocker on, every other site I visit no ads.