What's prefetching, and why do we use it?
Prefetching allows Facebook to download mobile content in advance. For example, let's say you've created a mobile ad that includes a link or call to action to your mobile website. When someone clicks the link or call to action on your ad, a portion of the content it's linked to may already have been prefetched and will appear more quickly.
Facebook prefetches a portion of both organic and ad content. Prefetching is beneficial for people using Facebook on slow or poor network connections. For people on Facebook, prefetching loads mobile site content faster, which improves the Facebook app experience on Android and iPhone devices.
For advertisers, prefetching has a number of benefits, including:
How prefetching works: