From my perspective, Reddit is qualitatively different from all the sites you mentioned. Reddit is the first large news site which allows its users to create th

From my perspective, Reddit is qualitatively different from all the sites you mentioned. Reddit is the first large news site which allows its users to create their own communities. Most of the content on Reddit these days isn't technology- or politically oriented at all. This has changed over the last year or so - there are subreddits for pretty much anything. What makes these communities special is that a lot of them have very specialized and very diverse knowledge, not necessarily related to the subjects Reddit's early adopters were interested in. There are subreddits for science, fitness, finance, sex, art and just about any other subject people would be interested in following. What gets to the default front page doesn't even begin scratching the surface of what the ecosystem has to offer. I have the contrarian opinion that Reddit won't be displaced for a long time in the realm of primarily text-based news sharing and discussion.