MySpace? Yes, before Facebook there was a site known as MySpace. The site has been declining in popularity in recent years but not on the Android. The native app on the Android market remains the most popular social app beating out Facebook among others.
Of course, we can’t be sure how this really effects the usage of the app on the phones. My Android phone came preloaded with the Facebook app so I did not have to download it. How many other phones are there where that’s been the case? It’s hard to say, but I would say that usage matters more than downloads.
Still, the Myspace app is said to be superior and hopefully the Facebook offering will catch up soon.