Facebook used to be an easy source to tap into, but since they have formed a public company with shareholders who need to be kept happy, Facebook have changed their Terms of Service several times recently and have clamped down on a number of things that used to make lead generation relatively easy. They have discouraged siphoning off clients to external web sites and CPA offers, and have raised the cost of advertisements that do this. It remains a viable lead source however.
The main website a lot of people use when they are online is social media. These websites are where you can sit there and talk to anyone around the world that you know, and chances are that most people you know have an account on these kinds of things. You’ll want to make sure you do some looking into making a business account, because marketing through your personal profile may not do so well for you. Social media sites are free to use, but they also have ways you can pay for ads that go out to people.