What a wonderfully deceptive title! No, twitter is not dangerous, but it can be frustrating. How so?
Well, if one enters a conversation and then tries to leave, one may find one's notifications filled up for days with people responding to the earliest part of the conversation. I chimed in on a discussion about collective guilt yesterday in the aftermath of the attack in Paris, and then realized it was something I didn't want to talk about. But the folks who read the first few messages keep replying to them so they keep popping up in my notification feed.
This is not a huge problem as I can try to ignore these folks in my feed. But I am easily distracted. Will I learn from this not to chime in on a conversation unless I am in it for the long haul? Absolutely not. My tweeting is filtered but only slightly, so I don't think and re-think every twitter conversation as I am about to enter them.
For those with more restraint and patience, this may not be a problem. For me, today, I am annoyed at myself. Oh well. A minor 21st century problem at best.