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BuiltWith Web Leads lets you get domains from customer data entered onto signup forms, contact us pages and other user generated forms on your website into reports within BuiltWith.
An example scenario - A person from a high profile eCommerce website comes to your business, they enter their email address on the contact page but then abandon the process. BuiltWith will have picked the domain of the email address out of the form and inserted it into the Web Leads report on BuiltWith. Using the Technology Market Share tab and Prioritize Report features of BuiltWith Pro you can easily pick out the high value signups/abandonments on your website and highlight them as high priority lead sources.
For more information on Web Leads and how to integrate them into your website visit the Web Leads Setup Knowledge Base Article.