Earlier quoted context omitted.
I'd push that the real value of Twitter is less the additional data sources and more the available discussion that's possible with smart people doing interesting things that you would not have as much access to. Only mentioning this because I personally didn't understand the value of Twitter for a long time and didn't understand why people used it, but now I think I do.
Is this really unique to Twitter, though? I've had very little difficulty contacting, i.e. academics whose papers I've read, or programmers who have written blog posts. You do miss some randos interjecting into the conversation, but these interjections detract from the conversation more often than they contribute. When I'm conversing with Joe Armstrong I'm not interested in the interjections of some rando who did an…
You also can learn unknown unknowns from things that are shared/discussed.
Direct email contact is great, but has a higher threshold to engage in. I think it’s different than twitter, it compliments it - but I think it’s also a lot less frequent because of that higher threshold.