What’s the suggested plugin, or shall I use multiple, for properly integrating my now WordPress-powered blog with Twitter and Facebook?

I want to be able to selectively post to Twitter and/or Facebook, and want to record external responses (replies/retweets on Twitter, comments on Facebook) in WordPress as well. Posting comments on FB-derived ones in WP will still break the discussion, but that I intend to think about after some trial period.

Furthermore I’m looking for a different Android-App than the one called ‘WordPress’ in the MarketPlayStore, since this one seems to break EXIF data on image upload :-(

So, my dear followers: Any hints appreciated on #tw and FB as well as on the blog :-)