[jkozera]

Hmm, seems a bit similar to social transactions at https://greenaddress.it/

You can send from GreenAddress.it's wallets to anyone over Facebook, email, and Reddit (Twitter coming soon). Then they receive an encrypted private key which can be redeemed on GreenAddress.it, or other wallets.

Also you can receive funds by sharing a 'Receive' link.

GreenAddress.it is maybe not as polished for this particular use case, but I think might be worth checking out as well.