I think the intent is to make people aware that someone can externally be happy/successful/etc but still be in a very bad place internally. People who have or do deal with depression and related conditions probably think this is so obvious it’s not worth pointing out, but I think a lot of them would be surprised how often the average person takes someone’s externalized condition and assumes it’s their entire experience.

I have no idea if posts like this picture do anything to actually inform people (and I’d bet not), but I guess I get what they’re going for.