Facebook is well known for being a beta user of A/B testing, having seemingly hundreds of tests going on at any one time across its increasingly diversified product line. However, this is Facebook, and we're all familiar with it.
Even though the screenshot has a bottom navigation bar, it is well apparent that the main tab bar at the top remains.This creates a confusion over app hierarchy, ultimating confusing end users by having multiple things that go to different places. The tab bar also does not follow the material guidelines, which say two or less options should use tabs instead, and have icons, not word-based descriptions.
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