I'm definitely getting old....
"That's fun for Reg readers at a conference, or crowds at concerts or sporting events, because it makes it easy to see who else tweeted about the event and what they said."
Why the fuck do I want to tell everyone I'm at a concert? Why the fuck do I want to see who else was tweeting that they were at the concert, and what they saying? You may be sure that all they are saying is "OMG at #xxxxx concert brill!"
There was a time when people went to concerts or sporting events to, y'know, actually watch what's on stage or on the pitch.