2021 it does not include not-safe-for-work content. Registered users who subscribe to subreddits see the top content from the subreddits to which they subscribe on their personal front pages. Front-page rank—for both the general front page and for individual subreddits—is determined by a combination of factors, including the age of the submission, positive ("upvoted") to negative ("downvoted") feedback ratio, and the total vote-count. Users and moderators Registering an account with Reddit is free and requires an email address. In addition to commenting and voting, registered users can also create their own subreddit on a topic of their choosing. In Reddit style, usernames begin with "u/". For example, noteworthy redditors include u/Poem_for_your_sprog, who responds to messages across Reddit in verse, u/Shitty_Watercolour who posts paintings in response to posts, u/gallowboob, with the second-highest karma on Reddit, and u/spez, the CEO of Reddit (Steve Huffman). Subreddits are overseen by moderators, Reddit users who earn the title by creating a subreddit or being promoted by a current moderator. These moderators are volunteers who manage their communities, set and enforce community-specific rules, remove posts and comments that violate these rules, and generally work to keep discussions in their subreddit on topic. Admins, by contrast, are paid to work for Reddit. Reddit also releases transparency reports annually which have information like how many posts have been taken down by moderators and for what reason. It also details information about requests law enforcement agencies have made for information about users or to take down content. In 2020, Reddit removed 6% of posts made on their platform (approx. 233 million). More than 99% of removals were marked as spam; the remainder made up of a mix of other offensive content. Around 131 million posts were removed by the automated moderator and the rest were taken down manually. It is estimated that Reddit's moderators do a total of 466 hours of work every day, which totals up to $3.4 million in unpaid work each year. This roughly equates to 2.8% of the company's annual revenue. Subreddits Subreddits (officially called communities) are user-created areas of interest where discussions on Reddit are organized. There are about 138,000 active subreddits (among a total of 1.2 million) . Subreddit names begin with "r/"; for instance, "r/science" is a community devoted to discussing scientific publications, while "r/gaming" is a community devoted to discussing video games and "r/worldnews" is for posting news articles from around