It isn’t clear exactly why the features have been blocked in the country.
But local reports have speculated that it is a way of protecting the revenues of traditional telecoms companies.
The FBI warns online daters of scams in which a suitor builds a relationship, only to ask for money.
The targets are often divorced or widowed women over 40, the agency said.
Penora came up with the idea for Gatsby after a female friend commented that a guy she met online was so creepy she wondered if he had a criminal record. In 2012, he had launched Friend Verifier, an app that scanned a user's Facebook friends and friend requests for registered sex offenders.
During the app's life, it scanned about 13 million unique Facebook accounts, Penora says, indicating people want to know who they're dealing with. Scott Fitzgerald's 1925 classic "The Great Gatsby" as the inspiration for the app's name.
Saudi Arabia, which had already blocked features of most chat apps, has moved to block Facebook Messenger.