Oh, right, another radical thought of mine - something that users would pay for. Even if it were just $1/month, one account per credit card only, it would serve as another little barrier to all the right people, and prevent throwaways and constant account deletion.

Obviously for a commercial, advertiser-funded operation, it is all about more and more users and traffic and the quality of the content isn't a priority, but this eventually destroys everything. I'm imagining something much smaller, but potentially higher quality and self-sustaining. I guess I'm pretty much describing The Well, but hopefully cheaper and with more users, but not free and as many users as possible.