I don't have a problem with it either - and there's a good chance I'll use it, if only occasionally.
What most of the people objecting to this feature don't seem to take account of is the fact that the very people whose privacy they're trying to protect are the same ones who will be making use of this function. Who else do they think is going to use it?
I appreciate there's a small and occasionally vocal group who'd prefer this to be a totally private forum but it's not... so get over it, frankly! Surely anyone who contributes to any open online forum must realise that their comments are liable to be disseminated beyond their original location. The 'share' function really doesn't change this.