My profile biography is exactly this! I have made categories of notable people on my profile, with the relationship to me and common ancestor. That way, I can tell when two notable people who are not commonly associated with each other, or you would even think of comparing to each other, might be close cousins.
I have also made lists of state governors, most with no connections, just as a placeholder to eventually and slowly connect them to the tree, and also to me. It gives me a random part of the global tree to explore for each governor. :)
My profile biography used to be public so people could see it but I have made it private recently, as it caused some WikiTree account members to harass me over it because I'm comparing myself to celebrities and politicians, or something. Not a fun experience, so I'm just keeping all my findings to myself now.