Note this is from a personal perspective
I got a good question from a Dean Beadle a international speaker on the autism spectrum with regards to faceblindness and the use of social media.
VOICE & PATTERNS OF MOVEMENT
The way in which I recognise people I have documented in various other blogs with regards to “seeing” faces or rather not and that is through patterns of movement (the way in which the person moves their body around the enviroment) and the person’s voices. Context helps through understanding (their full full name, significance of were I know them from).#
When it comes to social media it is best for people to message to help me remember where they came from. I do look for full names (that is a good start) and other contextual and associative information, although at times I have gotten it wrong in terms of sending the friend request to the wrong person it is a matter of trial and error for me. 🙂
Paul Isaacs 2016