1.Adverbial clause of concession: "While there aren't apps exclusively dedicated to collecting opinions" introduces a contrast, showing the ability to use complex sentence structures.
2.Present simple tense: "Platforms such as Facebook, Instagram, and Twitter allow users to express their views" uses the present simple tense to describe a general truth or habitual action, demonstrating a good grasp of basic grammar.
3.Relative clause: "that allow users to express their views" is a defining relative clause that provides essential information about the platforms, adding complexity to the sentence.
4.Noun phrase as subject: "user reviews on e-commerce sites like Amazon" serves as the subject of the sentence, using a complex noun phrase to describe a source of opinions, enhancing the depth and complexity of the expression.