For me, how entertaining or interesting a conversation is, depends a lot of the personality of my peer. Open minded people who are not being stubborn, who try to see things from different perspectives are good candidates, as I learn from them and provide a basis for further thinking. Still I prefer to talk IRL, as there's so much extra info in intonation and physical expression. Even calling with camera on makes a big difference. I find it interesting and even puzzling to know there are (apparently) smart people out there who don't find that having much added value.