You’d be astonished . . . okay, make that creeped out . . . no, horrified, if you knew how much information is collected about you each day through your digital activities.
If you dare to find out, start with this informative article in Quartz Magazine.
The task of these profile-mapping algorithms is to guess things that you are not likely to willingly reveal. These include your weaknesses, psychometric profile, IQ level, family situation, addictions, illnesses, whether we are about to separate or enter in a new relationship, your little obsessions (like gaming), and your serious commitments (like business projects).