Wow, that sounds awesome. Is that a specific app or website? Good idea overall. I could possibly use Roll20's tagging system to do that possibly. They do have quite a few different icons or tags you can add to tokens ...hmmm
I am in a similar situation and have decided it's okay to provide info they forgot to ask for by either writing it into my game journal which I post (I add a bullet list of the things the characters "know" at the end of my summary for each day and post it). Or, I have random NPCs tell them the...