I don’t know if they meet your criteria for a franchise, but any forum based website (including Reddit, Lemmy, etc) always ends up with at least 1 office, friends, or IT crowd reference somewhere in the thread. They’re definitely essential pop culture pillars, even if they don’t qualify as franchises
I’ve still never seen any of them though
I take it this is a reference to… Something, but I can’t figure it out. What?