As described by a previous poster, document management systems, such as Documentum or Sharepoint, are for corporate documents that require versioning, change control, and security.
We also need file sharing in Social Networking applications, beyond pictures and videos, so that members in the community can share business documents, such as presentations for the attendees of a conference. In that scenario, less is more regarding features. You don't want versioning or security. The security that governs the community, provided by the social networking application, is sufficient for the document sharing as well. You do want the ability to organize the files in folders (in any number of nested levels, although a few is probably sufficient), and you want the ability to have a few fields to describe the document, title, description, author, and maybe a user-defined field or two. Also, if you have a LOT of documents, the ability to assign tags for search engine purposes would also be helpful.
We use Sharepoint internally to manage corporate documents.
We want to create social communities and be able to share files within the communities.
The fact that a document might be redundant by existing in both places is not an issue to us.
The fact that the document in the community might become out-of-date is not an issue either. If it is important for the document to be kept up-to-date in the community, then the poster of the document should keep it up-to-date. Otherwise, it should be viewed as a point-in-time look at a document that was interesting at the moment.
