Facebook login as a requirement is a no from me, and the reason I cannot use it.
"It's tiring exchanging your social media accounts with every person you meet."
hmm, not really? not sure if its tiring or what is the problem being solved here...
if i want to give someone my IG i just tell them my name, if i want to give someone my FB i just tell them my name, if i want to give someone my number i just tell them my number. you didn't really make this process any shorter, definitely not enough.