It does, but this isn’t personal speech but corporate. I can say that buying an iPhone makes me smarter and irresistibly attractive and it’s covered by the first amendment, but it becomes corporate speech once Apple pays me to say that and is thus subject regulation about honesty and disclosure. This is noticeable in ads for things like athletic products – even if it’s a pro athlete they very publicly sponsor, the claims tend to be things like saying they only run in those shoes or some sports drink is part of their training because they don’t want a legal situation because it sounded too much like “Nike said I could run a 4 minute mile if I bought their shoe!”

Review curation is an especially good target for this because the question isn’t the speech but rather whose speech is promoted. Nobody gets in trouble if they accept testimonials and only use positive ones in ads because consumers know those aren’t unbiased but a review page which looks like anyone can post there is making a different promise.