Next time you leave an online community, spare a thought for your account, which will sit there accumulating messages, news and all other kinds of crap which you'll never, ever see again. Maybe you should do something about it.
After all, it's like forgetting to get mail sent to your new address: there's a constant stream of information and news, slowly building up at your old place, that you'll never be party to ever again. While it may mean nothing to you, it could be breaking somebody else's heart. You're better than that, right? [XKCD]