http://developers.facebook.com/docs/reference/api/post/
I see we can NOT use html while posting a post to groups, and the tag message_tags is only a readonly value.
bug status says by design! http://developers.facebook.com/bugs/247911678652789
I need to tag users in the posts I'm making , needed to ask if there is an alternative available?
No, like I said on that bug report, there is currently no way to add tags to posts via the API