This is a pretty old question but I will write a very answer to this. You can easily do this using the CloudRail API.
Supports integration of Facebook, Twitter, G+, Instagram, LinkedIn, Yahoo, Windows Live, GitHub and Slack..
Just have to create an object of each in the same way and get an app key and app secret key. For example
Facebook f = new Facebook(this, appKey, appSecret);
f.post(…)
Twitter t = new Twitter(this, appKey, appSecret);
t.post(…)
and so on.
HERE is a full blog post that shows you how to achieve this. Hope that helps
DISCLAIMER: I wrote that post