[travisp]

>However, it is absolutely no replacement for Flickr. Flickr does it better, and continually makes it better.

To an extent, you're correct about this. There are large numbers of people for whom Facebook is no replacement for Flickr. However, I, and many others have not posted a picture to Flickr for years (I once had a pro account event), because posting a picture to Facebook seems to be the easiest way to share it with everyone I care about.

But yes, calling the end of Foursquare is a bit premature. It does raise interesting points, however.