As for Twitter and "Fringe" and "Glee"....
As DR Jennifer already mentioned, the "tweet-peats" were previously mentioned when they were first announced here on HHW. -And I was not the one who posted that news.
The pilot for "Glee" originally aired back in May, then the director's cut was shown last Wednesday, then the "tweet-peat" last Friday. -And I believe there were already a few DRs who had talked about the show after it originally aired back in May, myself included.
I actually didn't think the "tweet-peat" really worked all that well either. There was some speculation - hope? - that Fox would change the format of the tweet-peat after the negative reactions they received after the "Fringe" tweet-peat. -And, in fact, due to technical difficulties, the tweeting started late during "Glee", and actually had to catch up for a bit once it did get started.
However, it was fun getting to "see" some of the commentary from the actors. -And it should be noted that a different set of actors tweeted during the West Coast feed.
It was a promotional gimmick, and for a good portion of their viewing audience it did work, even if it was not an ideal presentation. *And there were a bunch of tweets from the cast that did not make the TV feed, and it was fun following those live on the web.