Not sure why we are so determined to make social media a zero sum game. Each tool provides unique ideas. I think of social media marketing as weaving a marketing tapestry. The sections we weave with Pinterest are different than those we weave with Facebook.
I understand the need to zero sum the game. The belief is that time is NOT elastic so something has to go. Problem is this feels like a comparison between an apple and an orange. Facebook is about community and then content. Pinterest is about content and then community. Instead of one wiping the other out they are likely to meet in the middle.
If I had to choose one to win it would be Facebook. The larger installed base creates an expanding return. Pinterest takes no expertise to begin and a lot to continue. Facebook takes some expertise to begin and less to continue.
The winner will be decided by who uses their tool the best, what developers us their APIs to "app-up" our world. Again I would give Facebook the advantage. Pinterest wins on the it looks cool metric and that isn't nothing in a time when visuals are crushing textuals. Also, Pinterest makes Facebook feel like WORK. Pinterest feels like fun. That single advantage could, with some very smart moves and a few more Facebook missteps like mobile, win the race.
Via Stan Smith