Simple algorithms that make 'friend' suggestions don't cater for complexities found in human relationships, especially families.
My mother popped up on Facebook a few months ago as a "suggested friend". Her smile came up on the side of my screen, and I couldn't help but let my mouse gravitate to her name and linger over it.
With most people, if their mothers are already on Facebook then they're already "friends". But I became estranged from my parents half a decade ago, and hadn't exchanged words with my mother for over four years.
At a time when there's so much discussion about a "right to be forgotten" and methods to delete your digital life, I've done a lot to digitally forget my parents, and delete them from my digital life. I'd rejected invitations to connect from their work colleagues and friends so that snippets of their life wouldn't flash incidentally into mine and tempt me to linger.