Tags

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What is the purpose of tags? I thought that we were supposed to tag a discussion so that when we went back to it we could click on our tag which then took us straight to our own comments, which would save ages trawling through a lot of other comments - do you see what I mean? But when I click on one of my tags it takes me to similar discussions. I do read through other peoples comments but some days there isn't enough time and I just want to see if someone has responded to one of my comments. So, do you find tags useful??