Reddit is a community of completely anonymous members, each of them characterized only by a username and the web content they provide. Although when creating a Reddit account, there is no pressure for new users to submit any personal information (such as phone number, date of birth, full name) or reveal their true identity (unlike other social media websites), at the end of the day, anonymity remains a personal choice.
Every contribution reveals fragments of private info that could be put together by anyone who wishes to find out the real person behind a Reddit profile. For instance, if a member uses the same username on other social-networking platforms, then someone can easily identify them. For savvy internet users, the meta-information behind each post could also be a source of private data such as location, date. As per RedditCorporation's privacy policy, here is the confidential data they collect from registered users:
Location (pursued through GPS or Bluetooth).
The IP address is recorded for 100 days. Afterward, Reddit officially deletes it and only if the police ask access to the IP data for public security reasons or suspected criminal activity, they must oblige.
Username and password, referral URLs, device information, logging and usage data, pages visited, user-agent string, operating system, browser type, clicked links, hardware settings, requested URL, and search terms.
The majority of the personally identifiable data saved is deleted every 90 days from Reddit servers, except the IP address used to create a Reddit account, karma, preferred language, subscriptions, voting data, and date of the last login.