How to search for site users, resources, methods?

Question

Social media

Now a mega-cool product is ready, but how to properly convey it to consumers?
How and what channels to use?

Answer 1

Start by buying ads on banner and social networks.

Answer 2

It depends on the project. If it is designed for a narrow audience, then where this audience hangs out.
Articles/advertising on thematic sites. In themed hangouts.