Salesforce acquired SaaS collaboration service

It seams, that competition with MS Dynamics CRM is not enough for Salesforce. Now the company wants to become a full-fledged SaaS alternative to MS Sharepoint. It already provides the platform for developers (Force.com) and missing only the intranet functionality. To fill this white-space, Salesforce has just acquired GroupSwim, the SaaS collaboration service. GroupSwim is quite popular startup that allows you to create workgroups (sites) with a wiki, file-storage and forum discussions. Also it uses semantic technology to automatically tag and rate content including discussions, emails, documents, wikis, and more. Until now, Salesforce used integration with Google Apps as a primary collaboration solution. Besides, recently Box.net unveiled the solution for file-sharing in Salesforce CRM. But, apparently, Salesforce, that has recently created the social layer Chatter, now is going to create its own collaborative layer.