Jelly, for example, is one of the more recent ones. Developed by the founders of Twitter, it relies on people answering other people’s questions in real-time. Simple, useful and utterly addictive. Just as LinkedIn, Google+, Facebook, Pinterest, Twitter, Hive and myriad others are.
More importantly for brands, though, is that social sites like Jelly present yet more opportunities to experiment, to analyze how a business model which puts social engagement at its core can adapt trustworthy content for a new audience.