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I have found the idea Twitpay this week.
By using Twitpay any Twitter-user can send money to each other user.
You simply write a tweet like @twitteruser twitpay $5 reason for payment
An example with my Twitter name: @ Kathrin $ 5 for chocolate
The lucky recipient cannot paid out all his credit with Paypal yet, but he needs to save up a credit of $ 10. Then he can convert the money into an Amazon gift certificate or make a donation.
Because I have no Paypal account I can´t use Twitpay.
But I think it´s a nice safe payment option with great potential.