Twitter turned 20 this weekend, which sends us down memory lane. We share our best Twitter moments: Yoko Ono is apparently still a follower, Follow Fridays were a thing, and Jack Dorsey's first ever tweet was just "twttr." But the best story is Tim grammar-policing Solange Knowles on a public tweet, regretting it instantly, sending it anyway, and somehow living to tell the tale. She replied. He has dined out on it ever since.