Some one I dated for 5 months about 6 years ago has just come up on my fb as 'someone you might know'!
I don't really understand how fb algorithms work. He's not in my contact list - his messages aren't on my phone, he lives about 15 miles away and I didn't meet him locally so we've not checked in at any of the same places, we don't have any shared interests listed, mutual groups or friends... his connection to me would be as it would be with anyone I'd never met and equally had no common interests/connections with.
How on earth does this happen?