After having raised a $5 million in a first round of funding last month - from Founders Fund and Charles River Ventures - the West Hollywood, California-based Yammer has launched a comprehensive set of innovative features, which will facilitate greater communication between co-workers in an organization.

Yammer - known for offering a Twitter-like micro-messaging service for businesses - functions in such a way that users within a definite email domain can form and join Yammer groups; to communicate with one another via SMS or instant messaging.

In the case of businesses, users can communicate with their colleagues easily by sending short messages back and forth. The messages thus posted can be seen by any co-worker who chooses to "follow" the sent messages. The site's interface displays all the messages sent in reverse-chronological arrangement.

With the addition of new features, it will become much more convenient for users to import, share and discuss RSS feeds from other web sites; thereby implying an ease in tracking news reports, blogs of competing companies, as well as Twitter messages of others.

Yammer's recently-released software version can be hosted by companies on their own servers; with Yammer also working at alleviating security concerns of the companies, by allowing them to set their own terms of use for the site!