HTTP Headers are a standard web protocol sent between any browser request and any server on the internet. HTTP Headers include IP addresses, information about the web browser, page location, document, referrer and person using the website</li> <li>pixel-specific data: includes Pixel ID and the Facebook Cookie</li> <li>button click data: includes any buttons clicked by site visitors, the labels of those buttons and any pages visited as a result of the button clicks</li> <li>