If all ad methods hypothetically disappeared, what would be the alternatives for businesses to promote their services and goods?
If I'm looking for something to buy:
1. I'll search for it directly. In particular, I'm interested in solid reviews. This quite often means not giving much credence to review mills -- CNET, Yelp, etc., -- where the nature and intentions of reviewers are quite often suspect. Amazon have this problem as well, though to a very slightly lesser extent.
2. Map-based systems (OpenStreetMap, Google Maps) are often what I use when seeking a specific option locally. I suspect thes are underappreciated.
3. Classifieds systems. There's a reason Craigslist took off like it did, though its quality/relevance have been lagging for some time. It's still ground zero for housing ads.
High quality recommendations mean a lot. I happened to be reading a blog through one of my rare unfiltered browsers, and realised it included book recommendations on the sidebar, for which the blog editor was highly qualified to offer assessments and endorsements. The state of advertising is so bad that I had missed these previously. The blog would be better off putting those recommendations into posts or other content less likely to be filtered. First time in quite literally years that I'd had the least sense of missing something.