Most of my clients run social media as an effort to generate traffic. Image/branding, customer dialog etc. are clearly lower priorities. And Facebook is the undisputed leader in referring traffic to their sites, thanks to the newsfeed algorithm and its unbelievable usage stats. But second in referrals? Not Twitter, not Tumblr, not Vine, not Youtube - all platforms that are more discussed than Pinterest. I cannot find any usage stats for Germany, but in the US, Pinterest generates a lot of traffic and this is not only because of their user base, but also rooted in the structure of how the service works. If you have enough photos, that is.