This kind of thing will be the death of Venmo, and makes me wonder why they haven't moved faster. An app that already has your social network will have more success adding friend payments than your friend payments app trying to add a social network.
Is there really that much interest in paying friends electronically? I have just never had much reason for paying friends or accepting payment from them.
Seems like this is more about paying strangers, including possibly retailers.
OTOH, a payment app can grow pretty organically. It doesn't matter that I'm not "friends" with my friend Joe on Venmo if I don't need to send him money.