User Tagger is a fun and very easy way to make a Facebook and YouTube tagger for any users that you have. You don’t need to download any extra software, you just have to sign up for Facebook or YouTube, and you’ll be able to add tags to your friends on those websites. The extension will detect any users and find out who is who on each site, so you can tag a Facebook user that you’re following with something like “Watching [user_name]”, and a YouTube user with “Liked [channel_name]” or “Include [video_title] in this tag”.

You’ll also be able to add tags to your posts on Hacker News or anything else you see that has a link. You can also tag your own posts and comments with your name, just like with posts on Facebook and YouTube. This makes it much easier to keep track of what’s happening with you and your friends on those websites.