When it comes to real estate lead generation, nearly every agent is looking for an answer to the same question: What's the best lead source? In order to get the most out of your leads, you need to be able to see the ROI on all of your lead sources so you know where to spend those precious marketing dollars - and where to stop wasting them. To gain better insight into which lead sources brokers should be investing in, Imprev Thought Leader conducted a survey. Here are some findings.