Niche apps are kicking into high gear for users with specific criteria, and there’s something for everyone: muzmatch for Muslims, Mouse Mingle for Disney fans, Twindog for canine lovers, Sizzl for bacon aficionados, Bristl for beard enthusiasts and Dead Meet for morticians and other death professionals. In the mainstream, Match and Tinder have a new, serious competitor: Whitney Wolfe Herd’s Bumble. The feminist app debuts to a huge response — and a stinging lawsuit from Wolfe Herd’s former employer, Tinder.