They ended up discussing the book; it was a favorite of both of theirs. They ran into each other at a party a few weeks later, and both thought the coincidence was hilarious. They hit it off, and when one of their roommates was leaving town, they decided to live together.
As for Greg and Ted, they don’t have anywhere near such an interesting story.

Greg's got a 3DS?
Nope, not yet. Still trying to hold out until I actually have time to play games.
This comic clearly comes from THE FUTURE.
…See what we did there? The FUTURE?
Totally not planned. This was executed via time travel.
the flash back scenes kinda look like a smoke-filled room… just sayin, maybe a 'thought bubble' thingy would work better.