Basically a giant rolodex with contact information from low level to high level personnel, including chief marketing executives, etc of all kinds of companies world wide which you can review by making a payment or by earning points, visit the site for more information.
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If you get the result after performing a search:
No results matched your search.
Then it means just that and you don't pay for anything because the search is free, viewing the results in more detail if there are any do comes at a small fee or by earning points.
When you're shown results you'll see names and job titles, marketing related job titles are the people you need to connect with, namely executives, etc.
Usually when you perform Google searches for company name and "marketing executive" and other marketing and promotions related job titles you'll see names from press releases and company statements, but you can't find any contact info of that individual.
With Jigsaw.com you can usually find a direct email or phone number of that person, even direct lines to CEO's and decision makers in the marketing strategy departments of big corporations.
Read through this
blog first and you'll learn more about some of the pitfalls and how to avoid those pitfalls when reaching out to people at this level.
There are some interesting articles that applies to approaching end users, especially big corporations.