Rewrite Yammer API and integrate it to Graph API
Yammer API has not changed since a while and is really bad.
Documentation is old and do not represent all the routes possible to query.
A lot of useful routes to query are not available.
Authentication possibilities are very limited, nothing to do with how it is done for Graph API.
For all these reasons it would be great to have Yammer API rewritten as part of the Graph API.