Speaking of FB ad targeting in elections, I was recently surprised to learn that an advertiser can give FB a specific list of names of people they want to target.<p>I learned that because I own a handful of shares of Arconic, which is a company in the midst of a hostile takeover attempt. I was rather curious how FB figured that out... but both sides know my identity, and apparently whatever I agreed to when I opened a brokerage account included giving my identity to companies I invest in, and them giving it to activist investors, and the company/investors giving it to social networks.<p>My understanding is that in the US at least, it's common for both parties to attempt to maintain complete databases of all voters, so it's feasible for them to select individual ad targets themselves and just give FB the names.