The marketing industry is moving beyond trackers and cookies. Hastened by the mobile/tablet revolution (users switch devices way more often) and the stricter privacy laws in Europe (anti-cookie laws).

Now they either require you to login to get the "mobile" experience, like Facebook or Twitter, or they use probabilistic statistics to identify you without cookies.

That guy reading a newspaper in the park with a paper bag over his head and 4 goons on the lookout, feeding us uninformative/unlikely data, that guy is with 90% certainty Jacques Mattheij.

(When cookie-tracking was more common we set up a cookie-swap program. Stopped after a few months out of security concerns.)