Launching in 2010, Salesforce Chatter seems like the ultimate private social network for corporations. According to WebProNews, it lets users collaborate securely in real time with: Profiles, Status Updates, Feeds, Groups, Social Apps, Google Docs, Twitter, Facebook and more. Users are also able to build customized applications. Plus, this is all accessible via your mobile device, like an iPhone or BlackBerry.

It will be sold for a monthly fee of $50 per user and includes Salesforce Chatter, Salesforce Content and Force.com. Check out the quick video introducing Salesforce Chatter: