On: Tipjoy (YC W08) now allows payments via Twitter

[ntoshev]

You can define your market however you like, but as long as you fight over the same customers in the same context, you compete with each other.

Of course, there is nothing wrong with that.

[ivankirigin → ntoshev]

The biggest threat to those that implement this functionality is twitter itself. If Twitter chooses to do their own payments, I doubt any efforts from Tipjoy or Twitpay could change behavior.