When comparing Messenger vs Foursquare, the Slant community recommends Messenger for most people. In the question“What are the best Material Design apps?” Messenger is ranked 22nd while Foursquare is ranked 31st. The most important reason people chose Messenger is:
Allows communicating with anyone who's a friend on Facebook.
Specs
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Pros

Pro Uses Facebook friends to create a contacts list
Allows communicating with anyone who's a friend on Facebook.
Pro Read receipts
Can see who has seen each message in group messages.
Pro Easy to share posts from Facebook
Integration with Facebook makes it easy to share any interesting posts from the Facebook timeline.
Pro Great UI
User interface of the application is clean, intuitive and easy to overview.
Pro Custom search results
Foursquare learns about what you like from the places you go and the searches you make. The app will give you recommendations based on what you like not what other people search for.
Pro Connects with Facebook and Twitter
Use Foursquare with Facebook and Twitter to see what restaurants and other places your friends recommend. Also get tips from those you follow about places you might not yet know about.
Pro Follow friends and trusted voices
Foursquare lets you follow your friends and other people that you trust to have great taste in food and places. You can view tips left by the people you follow at the places you go.
Cons
Con Lack of privacy
Messenger is owned by Facebook. Based on their privacy policy, this means that any information you provide (including messages sent) are used by Facebook to profile you and sell access to your data to advertisers.
Con Lack of end-to-end encryption
Secret (end-to-end encrypted) chats are only supported in one-to-one messages, and are not enabled by default, and the encryption has not been verified independently.
