Idea: Create very targeted lists by using LinkedIn Helper & Hunter to scrape and save thousands of email addresses.
Details: Use your account on LinkedIn (premium account works better but is not necessary), LinkedIn Helper Chrome Extension, and a premium account on Hunter to run detailed searches and scrape their emails.
You can use title, company, school, first name, and last name to help narrow your search. You can also filter by connections and location to help refine the list.
Once you extract the data, you can then create a personalized email outreach campaign and/or add the list as a custom audience in Facebook to create extremely targeted ads. Keep in mind that these audiences will likely be cold leads and they will need to be warmed up before an offer is put in front of them.
Source & more details: alexeidos.net