Prevent users from starting multiple accounts?
问题 I know that in the end it, can't be done. But, what are the options to: a) limit the options for persons to create multiple accounts, b) increase the chance of detecting multiple accounts / person for a blog-like web service? (people can sign up for their own blog) Update: I think the 'limit the options' has been answered nicely. (there is no reliable method, but we can raise the bar) However, I would still like to know what other options there are to detect multiple accounts? 回答1: I'm