Check out this great post on building a strong author platform, from the How to eBook blog.
When writers are trying to build platform—in order to land a book deal—they often ask me questions like:
- How many Twitter followers do I need?
- How many Facebook likes should I have?
- How many website or blog visits are required?
- How many people need to be on my email newsletter list?
Every agent or publisher will throw out a different number to such questions, and usually, that number is made up.
read more https://www.janefriedman.com/building-a-strong-author-platform/
DSM Publications 