One of the more effective ways to use retargeting in a gentle lead nurturing sense is by using Facebook’s retargeting tool.
You simply run sponsored ads at highly targeted, useful content or a series of content and let Facebook tell you who visits and consumes the content. Once this mechanism is in place, you can start building custom audiences of the people that visited your free content with the knowledge that they may indeed be interested in a more substantial version of the content in exchange for an email address or opt-in.
This approach, while requiring more patience, opens up a much larger potential audience and will likely make your list conversions triple or quadruple.
Here’s a nice little tutorial on Facebook retargeting from Social Media Examiner
Please click through for more details. But please consider remarketing as a part of your program.