Bumble’s IPO (BMBL) turned Whitney Wolfe Herd into a self-made billionaire. Ms. Herd, 31, also rang the Nasdaq opening bell with her 1-year-old son in her arms. She came from Match’s Tinder, founding Bumble in 2014. That’s under 7 years to become a billionaire. Some sort of record. The two leading dating sites — Bumble […]