Barbara Corcoran, the real-estate guru, has been in LA to start taping the second season of ABC’s “Shark Tank,” where she’s a panelist to find young entrepreneurs. Creator Mark Burnett originally had somebody else lined up for the first season, but a very convincing letter from Corcoran changed his mind. Then, to campaign for the show’s renewal, she filed a 340-page pitch pointing out why it should come back. Network bosses announced in August it would have a new season of eight episodes. Corcoran’s rep said, “Wordy causes have really paid off.”