Im still very confused by instagram. What do they do that others dont? They announced a partnership with foursquare to provide photos to checkins a month ago. So you now need two apps to do what facebook does natively? And then you realize that less than 2 million people use these apps as opposed to the 600 million that use facebook?

I know that silicon valley has gone crazy for instagram, I guess I just dont see the need for a company that simply adds "filters" to your photos (of course only those taken on an iphone).

What happens when Apple says, "hey this filter thing is really cool, lets add it to our camera app" (just like they did with HDR)