I usually use reddit on three different devices: phone (Android, via chrome browser, google account 1) PC at home (Firefox browser, google account 2) PC at work (edge browser, switched to chrome in Jan. 2026 , no google account) I only log in sporadically to post and log out after I am done. I do not use sign I with google etc. . on Monday evening I visited a subreddit I usually don’t visit (cats) on my phone, I was not logged in to my reddit account, just browsing. on Tuesday I noticed that cats now was in the list of recently visited subreddits in ALL of these three devices and 4 browsers (still not logged in to reddit ). whenever I visited an other subreddit on either of these devices / browsers the change in the recently visited subreddit list applied to all the others simultaniously. this has never happened to me before and i find it very, very concerning. reddit synchronized my subreddit viewing history across three different devices (and four browsers) that are not connected (synchronized) with each other directly. deleting all reddit cookies fixed it (for now)   submitted by   /u/Dodsnev [link]   [comments]