The one ex I would like to check doesn't have social media, lives the other side of the world so no way of watching his life from afar.
I don't check up on other exes tho. I have one on Instagram and Facebook just in general but don't actively check - do see what he's up to though.
Actually the first ex I talk about, I have him on WhatsApp and can see when he was last active so I have actually looked at that from time to time to see. He only ever had the app to talk to me so I know if he's been online he's gone on to see if I have messaged