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Steps to reproduce the issue
What I expected
Info about the the request to Facebook, LinkedIn or Pinterest (for example) to get the sharing count information.
What happened instead
This text does not mention any requests to Facebook et al. for getting the counts.
This need to get mentioned for GDPR compliance and maybe there could be an easier way to opt out than using a filter: https://jetpack.com/2016/04/15/hook-month-customizing-sharing/
I think it have to be mentioned, because the IP address gets shared with Facebook, et al. - and IP address is a personally identifiable information in the context of the GDPR. The user needs to know that happens if he/she visits the page, which is not the case at the moment.
There are indeed requests made to Facebook and to Pinterest when you have those 2 non-official sharing buttons on a page. Those are the only 2 services that get requested at the moment. As you mentioned, that can be stopped with a filter,
The visitor's IP address is not directly sent to each service; only the post URL is. It may, however, appear in Facebook's or Pinterest's access logs as the IP address making the request.
IANAL, but to the best of my knowledge, submitting IP addresses to third party and storing them in their access logs is exactly something, the GDPR is supposed to prevent. This is not a matter of "enhancement" but a (legal) bug, which needs to be fixed if you want Jetpack to comply with GDPR.