Nope, I've never really been into it but I do try and make an effort with my colleagues who might be struggling / in a chatty mood. If I'm in a one on one chat / conversation with someone I like to ask them how they've been & what's going on. An extension/plugin for an existing tool might be interesting e.g. teams, slack etc. I tend to agree with other comments about an app not being able to replace the spontaneous in-person conversation we're talking about though.