Editor’s Note: A version of this story appeared in CNN Business’ Nightcap newsletter. To get it in your inbox, sign up for free, here. New York CNN — Bill Ackman, the Wall Street agitator who’s become an armchair political crusader for the put-upon billionaire class, is cashing in on his social media clout in a deal that could make him boatloads more money. See here: On Monday, Ackman announced that he’s selling a 10% stake — valued at more than $1 billion — in his Pershing Square hedge fund to a group of investors. Basically, all that means is that...