Re: why do people 'like' their own FB post or What happened to 'Skypeme' mode & other
A lot of people have different reasons. For example if someone posted a link to something, and they may like whatever it's linking to. Or if their status is about having a great day or sharing great news, then it's totally understandable to "like" that.
The photo thing can be a bit eyebrow-raising - especially if it's just of them. But if let's say it's a photo from a family reunion or even if it is by themselves doing something they've always wanted to do, I support their liking their own photo.
I'm not really sure it's weird.