Pfft. I can think of at least one situation I've been in where something like this would have been helpful, specifically in identifying *who* to reach out and communicate with.There was a time when people used to talk face to face and drink a beer together. This iNonsense only makes people more lonely than they already are.
The situations it would be useful in aren't ones it would be replacing. e.g., I was at a zombie film festival.. Obviously everyone there had a love of zombie films, and I would probably get on with most of them - but there were hundreds of people.. You can't talk to all of them to find out who's into what, can you? It could help you isolate people you'd really like to talk to. It'd be good for finding people to arrange games with etc too. If used well it couldn't do any harm, just help people meet & find common ground.