If registering your religious affiliation in your identity papers was what everyone was doing, maybe it lowered social friction, but in the long run it caused huge problems for a certain group of people when the government suddenly started tracking them down, and had very good tools to do so.

Whether or not this is a good or valid comparison, I think the argument about "if everyone are sharing, nobody will care" is plain wrong. In the right circumstances, it will always be possible to find some nugget of information to paint you in a bad light or cause you problems.

Either way, it's going to be very interesting to watch our future politicians lives be completely exposed down to the smallest detail, as it may be 20-30 years from now.