This is pretty amazing from an analytical/engineering standpoint. OTOH, it serves to justify my natural inclination to limit where and how often I participate

This is pretty amazing from an analytical/engineering standpoint. OTOH, it serves to justify my natural inclination to limit where and how often I participate on sites and/or particular media (e.g. chat apps). It's not just a matter of data/privacy, either. It's simply a matter of attention, available time, and the best use of that time. I went from BBSs, to Usenet News, to (mostly) niche sites on the web. The tendency of all of these to focus conversations made them (and make them) more useful to me - better uses of my time and attention - than social media. I pretty much only comment on this site, and on reddit, and only sporadically on either. I pretty much ignore almost all social media. Deleted facebook. Haven't regretted it for a moment. I understand that social media provides real value - in certain situations - for people. I just don't need it, personally.