A review of the account, which has since been taken down, portrays a typical teenager with a sense of humor and a preoccupation with girls. He is sometimes vulgar when discussing sex, and he often quotes explicit song lyrics. At times it’s difficult to discern what’s a song lyric and what’s not. How many of Trayvon’s tweets can be taken as literal is up for grabs. There are certain things that can be gleaned about Trayvon from his tweets: He loved the films Friday, starring Ice Cube and Chris Tucker, and Next Friday, both of which poke fun at street...