Facebook stock catapulted higher, over the 30 Dollar mark, Sheryl Sandberg sold stock last week at 28 Dollars. Something about diversifying, I guess that rings true for me. But this was a strange announcement from Facebook, quite simply it said "Come and see what we are building". The BusinessInsider has a few views on what it could be: Here Are All The Rumors About What Facebook Will Announce At Its Mysterious Jan. 15 Event. A phone? Maybe. I suspect some sort of communication software. The stock was up 5 and a quarter percent last evening to 30.59 Dollars. It is still down 19.5 percent since listing.