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I would assume that you would not get an impression if your ad content was never loaded which most ad blockers would prevent (AFAIK)

One obvious exception to this is the blocker 'Ad Nauseum', which loads and clicks the ad in order to screw up tracking data.

It's not the most popular blocker, but it seems to me that the risk of false "impressions" exists.

I should ask the social media platforms what their position on this subject is and write a blog with my findings.

UPDATE: I've done that.