In January 2008, Munroe developed an open-source chat moderation script named "Robot9000". Originally developed to moderate one of Munroe's xkcd-related IRC channels, the software's algorithm attempts to prevent repetition in IRC channels by temporarily muting users who send messages that are identical to a message that has been sent to the channel before. If users continue to send unoriginal messages, Robot9000 mutes the user for a longer period, quadrupling for each unoriginal message the user sends to the channel. Shortly after Munroe's blog post about the script went live, 4chan administrator Christopher Poole adapted the script to moderate the site's experimental /r9k/ board. Twitch offers Robot9000 ("r9k mode") as an optional feature for broadcasters and moderators to use in their channels' chat boxes.