Facebook on Friday released a Snapchat-like app called Poke,
which allows users to send private messages that expire after 1,
3, 5 or 10 seconds. Less than 24 hours later, it is already the
number one most downloaded app on Apple’s marketplace, less than
24 hours after it became available.  While we don’t necessarily
expect Poke to remain as number one, it’s clear that the
Facebook effect is still going strong. Here are the top free
iPhone apps at the time of writing; notice that Snapchat is at
number nine:  app store fb poke 730x308 In less than a day,
Facebooks Poke displaces Google Maps as the App Stores most
popular free app  Facebook doesn’t even have to release a
particularly exciting or unique app: Snapchat clearly already
exists. The fact is a critical mass will download and try it
simply because it comes from the social network.  Poke has
received a 3.5/5 star rating on the US App Store from 241
ratings, which isn’t as great as Google Maps, but then again it
was built in just 12 days. Compare that to