How will you handle chargebacks? If my Twitter account gets hacked, will I be responsible for the cost or will you be?
The problem for the hacker is that in order to get paid their fake Twitter account would need to be connected to a real PayPal account which is connected to a real bank account. The entire chain of transaction would be very traceable.
If your Twitter account is hacked you are going to immediately realize you are transacting over Twitter. You'd see pay tweets and transaction tweets occurring in real time. You could then easily just shut off your PayPal connection to Twitter in your Sell Simply account. We do not store any Twitter or PayPal login, password or account data at all.