helleborine - 12:05 am on Sep 24, 2012 (gmt 0)
Well we don't know how much "social signal" we're getting out of Pinterest NOFOLLOW links. I suspect none.
I have found that I have more traffic since I cleansed Pinterest of my content, and that increase came is summer when my traffic usually dips. While everyone's results will vary, for me, Pinterest was a measurable traffic vacuum that only returned referral crumbs.