So.cl ("social") is a research project from Microsoft’s FUSE Labs.
"So.cl combines social networking and search, to help people find and share interesting web pages in the way students do when they work together. So.cl helps you create rich posts, by assembling montages of visual web content." says Microsoft.
But So.cl is just similar to the Google Plus and Facebook which allows to rich media sharing just like the upload video option from Facebook and Google Plus, and real time sharing of videos via "video parties" Similar to the Hangout option from Google Plus.
"We expect students to continue using products such as Facebook, Twitter, LinkedIn and other existing social networks, as well as Bing, Google and other search tools. We hope to encourage students to re imagine how our everyday communication and learning tools can be improved, by researching, learning and sharing in their everyday lives" Says Microsoft, indirectly they are targeting to Google Plus, Since they uses Facebook login and their search API's are different from Bing and Microsoft claims it as a different product and not related to Bing.