I don't have a facebook account so that's an automatic rejection for me :-/
I'll revisit this once they add some other alternatives.
For example I could offer an ebook coughshameless plugcough:
https://leanpub.com/ideas_are_a_dime_a_dozen
And then have people send me Stellars to user id '007' rather than pay through the website.
The book is free to download but you get the idea.
I also don't have a Facebook account but providing something of value is my strategy.
No, the whole point of connecting with facebook is to focus on the UX of making electronic payments. Who's going to remember their coffee date's wallet is 1BeX1pVAjD94hNs6C5d2dB3TRnLx53dXg3? QR codes are cute, but haven't quite hit the mainstream. It's a lot easier to say "Ben Bitdiddle" and have Ben's facebook picture pop up.
The network effects of scanning your entire social graph (and the data contained within) doesn't hurt either. Works fantastically for Venmo.
(I can create a FB-linked account today, and say an SMS-linked account tomorrow, and then merge the two).