With the pending public offering of Facebook anticipated to be the largest tech IPO in history, it’s an interesting time to think about where we go from here. Some say “social is done,” Facebook is all the social media anyone would ever want or need. Unquestionably, as it nears one billion accounts, in the solar system of social media, Facebook is the Sun — the gravitational center around which everything social revolves.

But while some may pronounce that Facebook is all the social we’d ever need, users clearly haven’t gotten the memo. Instead, users are rapidly adopting new interest-based social networks such as Pinterest, Instagram, Thumb, Foodspotting, and even the very new Fitocracy. (Disclosure: BlueRun Ventures is an investor in Thumb and Foodspotting.)