Can Bill Ackman Cash in on His Growing Fame?

The billionaire investor’s profile has soared on social media. That could help him grow Pershing Square, his financial empire.

By Andrew Ross Sorkin, Ravi Mattu, Bernhard Warner, Sarah Kessler, Michael J. de la Merced, Lauren Hirsch, Ephrat Livni and Theodore Schleifer | NYTimes Business Day | Disclosure