In the end, all this is is just ad sales: I have alleged access to customers who want your product but don't know yet. I can share your company or product w/ them. They trust me. It will influence them to become your customer. Give me X."
And worse than that, many times those requests come with a price tag on top of providing the company's product or service for free.
And really it's no surprise given how social media works. Now any "idiot" can gain a following or an audience over some set of topics, or philosophy, or style, and gain a following that tunes. I say "idiot" less as a derogatory thing and more as a "every Joe or Jane" kind of thing who persists and is focused. Any following of people that tunes into something, anything, can often be cajoled into seeing or experiencing some mention or ad about an unrelated thing and that causes some %-age of that group to pay attention and some %-age of those that pay attention to potentially investigate further and possibly become paying customers of some company or product they didn't know about before. Certainly not rocket science and definitely not new.
What we're seeing here is merely a temporary fashion/trend that tends to focus heavily on luxury hotels and envious-appearing travel experiences.