Considering we've had Venmo[1], wallet/gmail[2] and Square Cash[3] since 2013, not really.

[1]: http://bits.blogs.nytimes.com/2012/03/20/after-2-years-in-be...

[2]: http://googlecommerce.blogspot.com/2013/05/send-money-to-fri...

[3]: http://allthingsd.com/20131015/the-money-is-in-the-email/

which of these were a way to send money through a social network's chat client?

SnapCash and SquareCash are one & the same. I think it's a great convenience to add CC to my FB, but since I do not use a real name, do not trust FB, and would be concerned about my account being compromised (though it probably makes you enter a CSC/PIN), I will not be using this any time in the near future.

I personally use SquareCash all the time, and also use PNC bank's complimentary POPmoney setup to transfer funds for free (with PNC, I scheduled a partial rent payment to go to my landlord's bank account automatically every paycheck).

Snapcash. Send money that disappears after a few seconds.

Snapchat is not the first one having payment via chat. Afaik wechat had that long time ago.

But this totally tells us about how slow facebook is moving. They had 100x people, 100x money but still end up 2x slower.