It comes down to what counts as admissible evidence in court. Also on and off, countries have tried asking travelers to submit all online social n/w profiles,

It comes down to what counts as admissible evidence in court. Also on and off, countries have tried asking travelers to submit all online social n/w profiles, under threat of perjury, during immigration. Every time there is a hue and cry, it gets rolled back, but one has to be vigilant.