Mark, Seth and Wes went to graduate school together at the University of Texas. Then they didn't.
They entered the consumer construct known as the 'real world' and embarked on what can only nominally be called "careers". At a propitious point somewhat short of The Singularity, technology reached a point where they could reconvene and share their nostalgic ruminations with the world.
After consulting an oracle, the crew decided to add Dylan. Why he thought spending his free time arguing with dropouts about philosophy would be a good idea is a mystery known only to him. Now, as a result of this confluence you have the opportunity to consume beverages, most likely hot but possibly cold, while staring lovingingly into the eyes of their likenesses.