Normal people don't, but the PR firm that runs DU does want an echo chamber. The young people (now a little older) in charge, like Skinner, Elad, etc. are being subcontracted by the PR firm to run the board. There is probably a room with a bunch of computers and the same six or seven people posting all day under many different handles, spewing out Democratic talking points. There may be other people across the country hired through one party apparatus or another to do a certain number of hours daily on DU and to watch out for any deviation from important talking points. I think Frenchie Cat fits that description: she always said she was some kind of "activist", when she wasn't posting the pictures of other people's day care kids online or writing drunken poetry. She also knew about Obama's trip to Europe during the 2008 campaign way before anyone else did, which led me to believe she had some inside-the-party info.
In the end, I think about 20 or 30 regular posters are hired guns of some sort under a number of different handles. There are a number of genuine regulars--Mike C, for example, is a real professor at Humbolt--but the genuine posters are not on all the time. Mostly, the hired guns are there to promote the talking points, sway conversations in the direction of the talking points, and get rid of people who are too far off message, even if they are true Democrats. For example, when the gays got too vocal, two years before Obama was ready to do something about DADT, many of them were tombstoned, even though they were true registered Democrats who had worked hard for the party. Or when the Hillary supporters in 2008 pointed out once too often that the "anointed one" was an empty suit, or complained too often that "regular posters" could use anti-woman filth when talking about both Hillary and Sarah Palin, these people were purged, self included. (And I who had worked for the party for so many years and had raised a lot of money for it was accused of being a right wing troll.) When Obamacare came out and good Democrats pointed out that it was a giveaway to the insurance companies and that the bill actually hurt the working poor--who would find it cheaper to pay the fine to the IRS than to scrape up the cost of the health insurance from their tiny budgets--these Democrats were purged on trumped up charges. I know of one bisexual poster who opposed Obamacare and was TSd for being "homophobic"!
What you need to understand about DU is that it is a PR project. To look "genuine", they have to allow some leeway, but when an important policy issue or election comes up, the firm's lackeys unleash "new" posters (with, mysteriously, many thousands of posts) to push the talking points all over the front page at rapid speed. Any genuine posters who disagree too vehemently are tombstoned for interfering with the PR. The lackeys, on the other hand, can post the most outrageous filth. (I'll never forget Frenchie Cat posting the picture of a rectum on a thread to insult the PUMAs. She didn't even get a wrist slap.) This means that DU is really a PR dump. Genuine Democrats who honestly want to discuss issues need not apply.
Dammit!!! Get nadin on this Toot Sweet!!! I want confirmation and parrot feathers by dawn!!!!