Tagging--Easy as ABC???

Tagging--a new way to share your ideas about books, photos and websites, right? Well, not if your computer is acting wacky, or if you have to sign up for bunches of more sites and remember even MORE passwords and user names. I've tried 3 times to add tags on the Ann Arbor library site for books I've read, and haven't been able to so far. Both LibraryThing and Amazon want me to sign up for an account, and I haven't done that yet. the CPL catalog is down, so I can't try to tag there. So, I'll tag this post and maybe that will count, right?