David Marcus makes Facebook's payment entrance far more realistic in my opinion. His experience in both mobile and payments seems like an ideal fit for not only Facebook, but any disruptive payment product taking advantage of the platform shift to mobile.
His open support of Bitcoin is yet another intriguing fact, given how much traction the crypto-currency is receiving in digital payments right now.
It's totally speculation, but there are some interesting dots to connect on this one. Marcus was hired to lead mobile messaging. What better way to send money than through mobile messaging? And he's a big Bitcoin guy.
I can only hope there is some truth behind these rumours that have been building.