My friend who is a personal trainer uses Venmo. I don't like how it posts to Facebook / other sites that the users have linked venmo to, everytime some pays someone.

Venmo doesn't post the amount to facebook on the payee's wall, but posts the short text description that the payer who pays the payee writes in venmo when making the payment.

IMO this is TMI and a 'not-so-good' friend of yours could see you receiving a lot of payments on venmo that appear on your facebook wall and then decide to rob you.