This is mortifying.
I'm not in touch with someone who left my work a couple of years ago and he doesn't have social media but his wife has a Facebook page.
I was distracted while sorting out my online banking and instead of paying £350 to Barclaycard I have bank transferred it to Barry. I had his details from a collection for a group gift and didn't realise till after I sent it.
I can't let the money slide but it is unreasonable to contact his wife through Facebook and let her know I'm a moron and ask for it back??