Unfortunately, FastPixel will not work properly on websites hosted by WordPress.com due to restrictions imposed by them on the use of the advanced-cache.php file needed to cache your pages. This file is essential for the caching mechanism that FastPixel and similar plugins use to enhance website performance by storing and serving cached content efficiently.
For users trying to implement FastPixel on WordPress.com, this restriction means that the plugin will not be able to create or utilize the advanced-cache.php file. As a result, the caching features of FastPixel will be disabled unfortunately.