I'm seeking a social network app for employees in the company that can do the following:
- allows people to communicate within a company or across everyone on the social network (they can have access to a group or to everyone)
- post and archive interesting links, documents, etc.
- start a thread that goes to a group or to everyone
- lookup people’s info (profile)
- integrate w email so I can know if someone posts something new or responds to a questions
- Open source + customized deployment is a plus.