So, the interesting thing I note so far is that the only accounts so far on that instance is the accounts of basically the labs group that setup the instance, and a "BBC Taster" account.
It will be rather more useful once they have accounts setup for BBC News, various BBC shows, and maybe individual BBC jouranists and opinion writers.
Right now, there's not much content to engage with. I'm sure that's coming though.
The struggle is probably, internally, for something that the Beeb is just dipping it's toes into, most BBC employees probably don't want more work (posting to this instance), so unless there is a mandate from the top, it might go nowhere.
@LiveByReason Yes I worry about that a bit too. It seems extraordinarily difficult to tear journalists away from their twitter/facebook/instagram accounts (with a few honourable exceptions), so perhaps that's why it's so tentative...