ShareGrove essentially let's people create groups and share things. Where everyone in the group sees the same thing at the same time. So if you have created a group and one member posts shares something everyone gets to see it at the same time. If you post something on your wall all members get to see it at the same time. Essentially we could see Facebook getting better chat features and going more mainstream as an IM client.
To know more about ShareGrove and how it works please check the video below.
ShareGrove made the announcement on their Facebook page.