Disable Jetpack FB sharing count updating feature

[jonoaldersonwp]

Jetpack comes with a feature to dynamically update Facebook share counts for posts. It does this by making a request to pixel.wp.com (via sharing.min.js), which in turn triggers a request to Facebook. This runs on single posts and on post archives (once for each post).

The functionality comes with performance and privacy concerns, but more significantly, we're not actually using these counts in the template (since previous initiatives replaced social sharing buttons with completely static implementations).

As such, this feature should be disabled. This can be done by introducing the following filter to wordpress.org site(s):

add_filter( 'jetpack_sharing_counts', '__return_false' );

[Otto42]

Added to a mu-plugin in [dotorg:16329].