Ask HN: Find community/audience relevant to your product

Problem: Business owners wanting to find communities where they can reach their possible target audience but face difficulties because it is a time consuming and tedious process with no centralized resource.

Solution: Building a product which enables the business owner to Search for a list of communities, forums, blogs, newsletters, social media influencers(Twitter/Instagram Accounts) based on categories such as Developers, Startup, Marketers, Designers, Music, Writers, etc.

Do you face such a problem? or anything similar? Would you pay for a solution like this?