I don’t doubt what you’re saying about your circles. I live in a different universe. If someone only communicates through Twitter, etc., that’s a useful filter

I don’t doubt what you’re saying about your circles. I live in a different universe. If someone only communicates through Twitter, etc., that’s a useful filter for me. I don’t have a Facebook account. “only talking to people you already know” Far from it. For example, the contact information for an author on a scientific paper often includes an email address.