Facebook just updated their latest iOS app, and they bring "marketplace" as the 2nd tab:
It sound to me a completely ripoff for apps like 5 miles and OfferUp. Not just the look and feel but also in many details and the workflow.
Looks Facebook has the tradition to simply copy from others: Twitter, snapchat, Foursquare, ...
Screenshots of 5 miles app:
Screenshots of OfferUp:
Sure Facebook can claim again they have the best engineers and how innovative they are... Since OfferUp and 5miles both support Facebook login so Facebook clearly know how those app performed, it's pretty scary right?