Tea, a provocative dating app designed to let women anonymously ask or warn each other about men they'd encountered, rocketed to the top spot on the U.S. Apple App Store this week.

Tea markets itself as a safe way for women to anonymously vet men they might meet on dating apps such as Tinder or Bumble — ensuring that the men are who they say they are, not criminals and not alrea...

The app announced it had discovered “unauthorized access to an archived data system” in a statement on social media Friday.