Hi, XRumer is pretty much dead. I had problems with it before, it was not able to bypass many of the newer protections forums employed. I think this is still the case. There is just too much complexity in using machines to do this.
I was looking the other day and found a service called WideCircles, you can see it at http://widecircles.net
What these guys do is use human based publishers to deliver message to the related target audience. In another words they don't spam like xrumer does, but their system selectively picks up which sites the publishers should visit to provide postings on. It's all being tracked in real time. I believe their stats our much better then what xrumer had anyways. In any case using human publisher and sophistication employed by human being to distribute those messages through social networks seems like much better approach to me.
Thanks.