[gregcohn]

Snapchat was a clever take but not particularly defensible.

The real test is whether FB will allow a strong competitor to survive and continue to consume its api.

Basically Twitter did the same thing to many of the basic tweet consumption & production apps -- the killer move Twitter made, though, was cutting off api access to those competitors, which FB have not AFAIK done. (Though another comment mentions that the find friends via FB feature is gone from snapchat, I haven't seen anyone commenting that they were cut off by FB and will assume it was snapchat's decision to remove it.)