Crowd marketing is a technology for promoting a business on the Internet. A link to the product is taken, entered into the text of a comment or post, and published where the target audience sees it: on thematic forums and platforms, on social networks, on news portals.
Placing crowd links is an art that a crowd marketer is engaged in. He knows where, when and in what form to post publications. Operates as follows:

finds forums and discussions with the greatest coverage of the client's target audience;
highlights relevant, relevant discussion threads;
writes a review about the company/product;
adds a link to the body of the text.
The review should organically fit into the general discussion and not cause the feeling of advertising.
A simple example of crowd marketing
The girl on Instagram asks for reviews of the Moisturizing cream. We write to her: “The remedy, of course, is good, but there is a budget alternative - the “Nutrition” cream. Nothing worse, and a discount on it just now, see for yourself. And we're attaching a link.

What do we get from crowd marketing in this way:

site visits, increased traffic;
conversions;
accumulation of reference mass, growth of the ranking in search results;
brand recognition, reputation improvement.