> While it seems weird to search by image right now, it will probably feel more natural once it's seamless;

Especially when we become so "plugged in" that I can search for what I see. Right now, if I want to see "tomato recipes" I'm probably not inclined to pull my phone out, take a picture (and who wants that on their stream anyway?) and then paste picture + recipes? I'd rather just type "tomato recipes". But if I can search what I see and speak, e.g. "oh look, tomatoes? Find recipes!" that's much easier.