A lot of it comes down to messages not having:
1. A target audience
2. A price
Once they do, determining which messages you're willing to miss out gets a lot easier.
Discussion
Yes, targeting and price are essential. That's why I always read my zap notes. They paid to say that!
work related is always important... sometimes coworkers are annoying but mostly they go through phases, if it gets bad it's not hard to show an administrator and get this person pulled into line