Present participle as an adverbial: "choosing to complain in writing, especially online" uses "choosing" as a present participle phrase to describe the current trend of complaints, adding descriptive and fluent qualities to the sentence.
Conditional adverbial clause: "if you have a bad experience, you can share it quickly online" serves as a conditional adverbial clause, specifying the trigger conditions for complaints, enhancing the logic and practicality of the sentence.
Passive voice: "It’s visible, immediate, and can lead to quicker action from companies" uses the passive voice to describe the company's response, highlighting the impact of customer behavior on company responses, adding objectivity and logic to the sentence.