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Many do. Pinterest, Twitter, etc. They fetch those <a>'s and then rewrite the code via js. Googebot sees both, the one with the rel=nofollow and the one without as they are capable of executing javascript.</a> <a>There's no impact on your end, if that's what you are wondering, however, given the latest statements by Matt Cutts, widget links should be nofollowed and Pinterest isn't following Google's guidelines, but I guess those kind of penalties (penguin) do not apply to that kind of sites... although I think they should.</a>