The management for Slashdot.org is through a company called the Open Source Technology Group (OSTC) and run by Jeff "Hemos" Bates, he is the administrator of the site. There is an editorial staff who chooses which stories to post and a moderation system that tries to keep trolls and flamers to a minimum. The moderation system a quite intricate, for a full explanation, you can click here to view slashdots FAQ on moderation.