Does Pinterest's javascript removes rel="nofollow" ?

[smarties954]

It's late and I might be seeing things disappear...but I noticed something strange with a Pin It button we added in our website:

I added a rel="nofollow" to the  <a href="">for Pinterest, however when I use the html inspector in IE or Firefox, and inspect the attributes of the link, 'rel=nofollow' is nowhere to be found.</a>

<a href="">Did anyone notice this?
Does Pinterest's javascript remove the 'rel' attribute? (looks like it's the case)
How does google treats this? Do they interpret the .js and ignore the 'rel=nofollow'?

I hope it's a technical error on my end, otherwise thousands of website owners are being tricked into believing that they added a rel=nofollow, when in fact it's just being removed behind the scene.</a>

[FedeEinhorn]

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>