Took action on this method yesterday.. had over 340 visits, 60 hops, but $0 sales.
I've been having some problems with comments on news blogs. They seem to be getting removed
when I post a link into the comment area. Disqus is even more difficult to get the links to stick.
It seems that the majority of traffic came directly from Facebook. Not sure how others are getting a lot
of traffic from the news blogs, because they aren't sticking too well for me even with creative comments.
I'm in the same situation as you for blog commenting. But I've yet tried facebook.