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It's possible I've infected myself with Malware or something, but...
Just recently I've noticed URL links being inserted into forum posts, with a hoverover description "Shopping Link added by Skimwords".
I can't easily tell what's being linked by the poster and what's an advertisement by Skimwords, it's pretty annoying... and like there isn't enough other advertising on this web page in the first place.
I am using Chrome, with 0 extensions, and it's pretty much just this site I've noticed them.