Up to 10.1.2 Accessible attributes and the first validation
up to 10.1.3 User/Micropost associations
Up to 10.1.4 Micropost refinements
Up to 10.1.5 Content validations
Up to 10.2 Showing microposts
up to 10.2.2 Sample microposts
Up to 10.3 Manipulating microposts
up to 10.3.2 Creating microposts
Up to 10.3.3 A proto-feed
Up to 10.3.4 Destroying microposts
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Add user microposts