Facebook is your best choice. I haven't tried Pinterest yet but I doubt it'll be better than facebook. Facebook has a larger number of users
Facebook is the best site for social media lead generation. Why? For starters, more than 2.45 billion people use Facebook every month—making it the social media platform with the largest population. Facebook also offers some of the sharpest tools to collect leads on its platform.
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Another vote for Facebook. We got our best leads from this platform. Advertisement is not cheap (depends on your niche), but for us it worked just fine.