I was thinking more along the lines of the players seeing an NPC in a tavern. They are at another table, they don't have any interaction, they don't talk to them. But I want to mark that the players know of this NPC even if they don't know anything about them.
That NPC is now a blue outline around the bubble.
Later, the players witness a murder and see a figure leaving the scene. That person matches the person that they saw last month in the tavern. Do a quick perception check and/or KS:Local and I can reveal that information and the players can go back to the tavern to start collecting information.
That NPC is now a green bubble.
Without that previous link, the players have no leads. And some of us have stupid short memories....
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