My team is working on an email marketing service which is ridiculously cheaper than Mailchimp and can handle email marketing blasts quickly. I want to reach out content sites and Facebook pages. How do I find them? For example I don't want to contact small sites which have less than 10,000 subscribers or big whales like viralnova who will not show interest in our product. Businesses with 100k-2million subs will be the perfect number. How can I find them?