I like to integrate Facebook, twitter and Google plus to my app, so that using the app, user can update their status. Therefore I like to know how this can be done.
As for facebook and twitter, you can do this through their API. For facebook, fortunately they have provide android developer with facebook sdk for android, example included on the SDK.
And for Twitter you can use external libraries as written on twitter developer docs, and there is a library called Twitter4J that is android ready.
Unfortunately Google Plus API are not available yet.