Search around for some discussions on introductions. Well, that search might yield a large number of results, but the gist is that we like it this way. Hell, look about 12 threads down in this forum, and there's a post that pretty much explains all this.
I don't personally care if someone does a formal introduction, or they jump in and join in the conversation. That's just me. Others prefer a formal introduction, or at least someone who thinks "hmmm, I should introduce myself here, but I don't see anywhere to do it. Lemme search and see what others have done." etc.
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