I'm sure Facebook will be lower than this in terms of awareness of adblock, considering the number of oldies there (including my relatives) who can't distinguish between sponsored content and original content. I'm honestly surprised LinkedIn has such high numbers, since I assumed the LinkedIn crowd would be more technologically savvy.
Tech savvy crowd and engineers probably only use linkedin once a full moon to fill out their details. The rest are recruiters, PR, management, students, and so on. Those are the regulars. You don't use linkedin when you have a job unless that is your job.
Employed engineer here. I use linkedin to network and as a result I get a few inbound recruiting requests a week. Most are contract roles I'm not interested in, but some are for interesting companies that I wouldn't have found on a job board. I try to take interviews for the latter.
Going through an interview with nothing to lose helps me keep up my networking and interviewing soft skills. The best time to find a job is when you don't need one.
I think the parent comment is about adblock awareness by advertisers. One reason their invasive tracking might say they have less visitors than their ad network is because some of the people clicking their ads block their invasive tracking.
