Here’s an interesting thought. What if you had to pay for a new account in Safecoin? Sounds weird, and circular. But, what if to even get started, you need to have Safecoins. Or MaidSafeCoins. So I can’t even have an account unless someone invites me to the network by transferring me Safecoins. So for someone to create a ton of new accounts, they’d be paying the network and eventually the cost would just be too high. Then, couple this with another barrier of entry, like speaker recognition or captcha or something.
This also adds a strange (but historically successful) level of interest for the network through exclusivity. Invitation systems have always been successful. And its not ACTUAL exclusivity, because it should be pretty easy to get coins. People on Twitter/Facebook would be asking for coins from friends, generating interesting.
Could something like that work?