1) Someone, an amateur, probably got their nose out of joint out of some frustration.
2)MPAA attack method.
3) Bad advertiser, junk code or someone deliberately doing an attack of some kind.
Is all I can think of, though Abe and Russ don't like it, I take my own security seriously by using both Adblock Plus and NoScript, writing text lines within the firewall to limit damage and keep AVG and Malwarebytes updated.
Thank You to Russtronic™ for my sig!