If you want to see someone’s Reddit history, there are a few different ways you can do it. One way is to simply look through their user profile. If they have their account set to public, then you will be able to see everything they’ve posted and commented on. Another way is to use a tool like RES (Reddit Enhancement Suite). RES is a browser extension that makes browsing Reddit much easier and gives you some additional features, like the ability to see someone’s comment and posting history. Finally, if you have access to the person’s computer, you can check their browser history to see what websites they’ve been visiting.