It's mostly significant because it means Richie talked to me. Just a little, but still.
As for an RT, you can do one a couple of ways. If I make a tweet - which is usually a snarky/goofy comment (depending on the amount of sleep I haven't had) people have the ability to search the tweet out if they don't follow me, depending on key words I've used, or if they do follow me, they see it automatically. If they particularly like what I happened to say, there's a button under where they see the tweet that they can hit to 'retweet' my comment, so that it will show up in their timeline for their followers to see.
The other way you can retweet someone is to copy and paste their comment and add your own remarks to the end of it. Since I'm *still* reeling over the fact Richie gave me an RT, I'll break it down a little. By starting off your tweet with someone's Twitter address, you make sure the tweet goes directly to them. It won't show up to people who follow you unless they also follow the person it's directed to, so it's semi-private.
The tweet I sent Richie was '@TheRealSambora I really am perpetually invisible, aren't I?'
When doing a Copy&Paste retweet, you add the name of the person who originally tweeted it, both to give them credit and to make sure that they can see you've retweeted it. “@LostInHeadSpace: @TheRealSambora I really am perpetually invisible, aren't I?” not anymore!
The quotation marks are there to ensure it's not a 'directed' tweet, so that all of his followers can see his comment. Richie has been doing Q&A/shoutout sessions on weeknights, lots of fans begging for him to say hi, answer questions, or otherwise acknowledge their existence, myself included. He's got about 6k followers and climbing, so getting a reply from him is pretty awesome.
Quis custodiet ipsos custodes?