> but I still had a part of my brain thinking about the missed opportunities in building value / wealth. Hm.

I think this was your main point right? I also feel the same, but not because of Twitter. I think Twitter is an amazing social platform but it takes certain type of people to succeed on it. I'm sure there are tons of people who are very smart and is making more or creating something cooler but not broadcasting it on Twitter. Maybe you are one of those people.