Thx for all the responses. Just a couple of thoughts.
1. I am not on Facebook because (IMHO) it is a dishonest organization that has facilitated genocide, subversion and in general the distribution of disinformation, idiocy and blatant lies.
2. Advertising that is intrusive, idiotic, uninformative and generally tries to dupe people into buying worthless junk is wrong. Advertising today makes Don Draper and his crew look like saints.
3. Privacy is crucial in the digital word. Collecting massive data files on individuals can only lead to its inevitable misuse and abuse.
4. Facebook and their derivatives pander to the weak minded who are unable to critically evaluate objective information and form an rational opinion. Information on these people is then sold to advertisers who further exploit their vulnerabilities. Very sad situation.