HackThisSite.org, commonly referred to as HTS, is an online hacking and security website founded by Jeremy Hammond. The site is maintained by members of the community after his departure. It aims to provide users with a way to learn and practice basic and advanced "hacking" skills through a series of challenges in a safe and legal environment. The organization has a user base of over a million, though the number of active members is believed to be much lower. The most users online at the same time was 19,950 on February 5, 2018 at 2:46 a.m. CT.HackThisSite involves a small, loose team of developers and moderators who maintain its website, IRC server, and related projects. It produces an e-zine which it releases at various hacker conventions and through its hackbloc portal. Hard copies of the magazine are published by Microcosm and Quimbys. It also has a short news/blog section run by developers.

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