Plants that tweet when they need water? That’s so two years ago, man. No, the future is a much more exciting place where, as this video shows, a robot can snap a picture, upload it to Twitpic and then tell the world all about it on Twitter, simply by using a touch sensor attached to its front. What’s more, the whole thing is controlled by Nokia’s latest smartphone, the N900. It’s a brave new world, people….