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Facebook has finally managed to make its iOS app less terrible. The new update is faster and less error prone than the old app was, and it is much nicer to look at, too. Facebook is reportedly now making its staff use the Android app until they update it, so we'll probably see a better version of that app out soon.
Viator Tours and Activities
Platform: iOS (iPhone and iPad)
Viator's app lets you book over 10,000 tours or activities in over 800 locations around the world. You can see what other Viator users have said about the activities and write your own reviews.