Hashtag (from Tweeting)
Think about his friend's death, which he is trying to believe was an accident instead of suicide:
...and now my foot is wedged into the [toilet] bowl at an angle that looks like a joke picture someone should post on social media. But it sure doesn't feel like a joke, and I don't post stuff like that and LOL. Not anymore. #becausenothingisfunnynow.
Well, to say the obvious, the hashtag has a specific meaning in tweeting. And then the hashtag can be used in non-tweeting to have the same meaning, or a similar meaning, or a metaphorical meaning. Whatever.
(Before We Go Extinct, Rivers, page 4, 2016)
So this is very quickly going to leak into writing, in a thousand places.