Snapchat, the little app that came out of nowhere – well, Stanford University, but launched with no media fanfare by a couple of students whose service now supports 50 million snaps a day – has been joined by a similar "ephemeral messaging" app by Facebook: Poke. But now that perishable photo-sharing (the photos disappear in 10 seconds or less) is a trend, let's look at what's really interesting, … [Read more...] about Perishable pix: First Snapchat, now Poke