Buddypress Integration with Directory and Setup

Hi,

I have your directory plugin installed and in the process of setting up my site which is similar to yelp.com.

I need help with the following:

1. Integrate buddypress with Directory plugin multisite setup.
2. Users will be able to search and view all listings on the directory. But in order to review a business they will have to be signed in.
3. They should be able to sign up using multiple social networking platforms ie. Facebook, Twitter, Google+, Open ID etc.
4. Would like to know if they can link multiple social network accounts into buddypress.
5. Also any reviews that they do on the directory should show up on their wall or activity on buddypress. Also if possible post they same on the social networks that they have linked buddypress with.

Thanks and Regards,
Alagiri