Update: Aug. 3
The Washington Post's Rick Maese reports "Sports agents are diving through their clients' old tweets, trying to prevent the next black eye". The recent flaps about Josh Hader (Milwaukee Brewers, who pitched in the All-Star Game in Washington) and Nationals' infielder Trea Turner about homophobic or racist tweets when teenagers have caused agents (aka "Jerry Maguire", the 1996 film with Tom Cruise) to do reputation checks on players, because combative, largely left-wing trolls are searching for tweets they can pin on stars. My own reaction would be to ignore teen posts made out of immaturity. Listen to Dr. Phil.
The social media behavior issue gets worse. Look at this incident involving the Red Sox and Yankees.