My favorite tweet this week was an exchange between Gregg Lemkau, co-head of investment banking at Goldman, and his sister Kristin, named to oversee a new wealth management group at JPMorgan.

He congratulates her, while joking everyone should still bank with Goldman.

It’s funny, of course, but my big takeaway was how Twitter can be an incredible tool to follow key Fintech people.

It explains why we have integrated social media into the Bloomberg terminal.

Kristin’s appointment may have surprised some people because she was in marketing, not banking, but her Twitter feed showed she was on fire.

She was winning awards, speaking at big events, like the WebSummit conference in Lisbon in October, and hobnobbing with Serena Williams at the U.S. Open.

Anyone watching her posts over the past year could see her stature at the bank growing, along with her confidence speaking out on the need for gender equality.

You also learn she’s a big fan of Melinda Gates and prefers Sancerre. She’s a Red Sox fan and her son lost a tooth at Madison Square Garden.

If I were a reporter watching that feed I would have interviewed her. If I were a headhunter I would have sought to recruit her.

Jamie Dimon, evidently seeing the same thing, promoted her.