I really don't know what Twitter's next move is. They've done a great job of building a successful platform. But the product is very simple (by design), and it

I really don't know what Twitter's next move is. They've done a great job of building a successful platform. But the product is very simple (by design), and it seems they've largely exhausted the obvious extensions to it. How are they going to stay relevant for the next 5-10 years?