Robert_Charlton - 6:59 pm on Jul 18, 2012 (gmt 0)
I can't imagine that Pinterest as a very solid or steady source of inbound links... at least of the kind that would support long term rankings in Google. These aren't what I'd call editorial votes.
They might well drive traffic for a while and act to confirm inbound link acquisition, but IMO probably won't help you build authoritate links. I've got to think that social links like this are going to fade considerably faster than blog links... and if your only source of inbounds was from Pinterest, then you have a lot of work to do.
Take a look at this thread, pre-Pinterest, but still possibly food for thought...
Does Google "Age" Your Backlinks?