Bill Ackman went on a crusade to out Harvard's anti-Israel students. He's having second thoughts.

• Bill Ackman seems to be reconsidering his earlier calls to out anti-Israel Harvard students.
• On Tuesday, he tweeted about a video of a masked man on Harvard Square expressing love for Hamas.
• Ackman wrote that identifying this man "isn't the answer," and instead blamed social media.

After calling on Harvard University to reveal the names of students who signed an anti-Israel letter last month, billionaire Bill Ackman isn't so sure anymore.