Reddit is a social news aggregation site that allows users to submit and share content. Users can vote on submissions using up and down arrows. To share a post, users enter the recipient's email and their own contact information, then type a message and the captcha. Registering for an account is optional and only requires a username and password. To submit a link, users enter the URL, title, category, and captcha. They can also add an optional description. Reddit limits users to submitting one link every 9 minutes to prevent spamming. Frequent or abusive submissions may lead to account or IP bans by moderators.