Find contact details and reach out to 200 potential survey respondents

I am currently doing a research focused on crowdfunding for renewable energy. In order to carry out the study, I need to interview 6-10 people who have invested in renewable energy through a crowdfunding platform. The work would involve looking up people and investor groups on LinkedIn (and other social media). Qualified respondends will most likely have a background in investments and the crowdfunding industry. Example: if you go to [login to view URL] you will see in the top right that there are over 1700 investors on this crowdfunding platform alone. I need to reach people like them online and ask them to answer my questionnaire.