zork - 4:31 pm on Apr 9, 2013 (gmt 0)
To answer the OP's question, Pinterest can be a very good source of traffic if you target the right niche. I have some sites getting over 15k uniques a day from Pinterest alone, others not so much. I used a template for all sites in this test group and simply switched niches from site to site and found the ones that work and the ones that don't. I may not be the typical site owner as it seems that most people on this forum are concerned about making one or two sites successful while I work more on a performance-based model, but if you are the latter as well then I suggest doing a similar test to mine with all the social sites. It's quite revealing!