Full definition
Facebook Pixel is a snippet of JavaScript code installed on your site. It tracks visitors and enables retargeting, conversion tracking, and optimization for Facebook ads. It's essential for anyone running paid Facebook advertising.
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TL;DR — In one line
Tracking code that identifies visitors to your site
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The Best-Performing Facebook Ad Formats in 2026
We tested every format. Here are the 2026 winners — including examples and what works in which niche.
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