Twitter & facebook connect for my buddypress users

Hi!

Everybody like share on social newtork, not just site owners but site users too!

I was looking for, without find anything, a plugin that let my buddypress users to connect his BP account with Twitter & FB account so every activity on buddypress site will be notify on FB and Twitter.

It’s what mobile APP like FourSquare and Instagram do!

so:

1) does exist such a thing?

2) if not, what should be a right price for a developer?

3) if I’d decide to post a job for this does anybody would like to join me and share the developing cost ?

Cheers!