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commentary and criticism are generally considered Fair Use. But if the copyright holder is displeased,

Conventional wisdom (and the Electronic Frontier Foundation) says that an unauthorized screenshot is an infringement. That said, the use of screenshots rarely triggers a complaint because either: (1) the copyright owners don’t want to complain about something that promotes their company -- for example, an online tutorial about using Microsoft Word, or a book about starting an eBay business, or (2) the copyright owners believe the use is likely to be excused as a fair use. Although issues don’t often arise, occasionally copyright owners do complain -- for example, Apple complained about prerelease screenshots of the iPhone. Some sites place limits on your use of screenshots in their user agreements.