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You can let them signup with their twitter account, but then prompt them for their email address. Almost like a 2 stage signup. Best of both worlds. Click a button to sign in with twitter, enter your email address and get started.

If you expand to facebook let me know. I would love to filter out the spam from my family members about MLM crap. :D

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We did actually consider prompting for an email address once they sign up with Twitter. However, whenever I've used an app that does that to me I just leave the site and don't go back and thought that if I didn't like it happening to me, it wouldn't be fair to do it to others.

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