1. I am a Twitter junkie, and have been since '08. It's rare that you'll find a time when I don't have Twitter open in a tab; I'm checking 24/7.
2. I just think the DM feature could be improved. It's too hidden in the current UI on desktop and mobile.
What I've found over time is that, somewhat unsurprisingly, following people I know always results in more interest and engagement when I'm scanning.