Have you intentionally left out Facebook in your list of alternatives? Because I think that is where many discussions have moved to, and it's pretty good for th

Have you intentionally left out Facebook in your list of alternatives? Because I think that is where many discussions have moved to, and it's pretty good for that. Articles posted by news pages have kinda-threaded comments, and Facebook's trademark "Like" button fits in well, too. I think that's a good example of how sites can evolve (so Twitter could, too).