I know the question is over a year old. However, if you search on Google this question keeps coming up in the results. Thats why I felt the need to provide another answer.
Since June 2012 a nice library called socialauth-android exists to easily integrate the 4 popular social networks (Facebook, Twitter, Myspace, LinkedIn).
I haven't had any hands on experience with this library yet, but it looks very promising. I will post more details once I've played with the library.
Please see socialauth-android website
Alternative Link : - GitHub
