My Amazon account is my entry to the cloud, my saved files on S3, virtual machines I fire up. My Facebook account is bound to 30 apps I developed (many of them are active and running) and my key to several other sites/services, Spotify for example. And finally my Google account, which is even more essential. My main mail account lives there, Analytics, AdWords, et cetera.
I think I (and you) should be nice and thankful to them. If one of them would cancel my account, I’d be totally fucked.