Countdown to the next mass shooting

[Johnny Cupcakes]

Define "mass shooting".

Are we talking about the ones that make the news because a dozen people are killed? Or are we talking about the situations where someone shoots 5 people who all live so it doesn't really make a big story outside of local news?

If it's the big one, it probably won't happen for several months (, but if you're talking about these smaller incidents, there's a decent chance that it's happened since this thread was created.