How to find people by email address?

Services lik开发者_如何学Pythone rapportive are able to link an email address with a twitter account and a name. I was wondering how they are doing this?

I believe you can use the user search function in the Twitter API to search for email addresses.

Runs a search for users similar to Find People button on Twitter.com. The results returned by people search on Twitter.com are the same as those returned by this API request.

Aha, after some searching, rapleaf seems to provide what I was looking for.