If the government is interested in someone they will find them. Unless you live totally off grid which is not possible for most. I mostly use face book to communicate with former classmates.
Anyone important I can call or text or write a letter or go visit personally.
Back when I grew up and I am almost 30 now we barely had the internet. People actually e-mailed and replied back. Nowadays if I try to reach some of my friends via telephone they don't answer. A lot of people are impossible to reach via AIM, Cell, Text, Facebook, Email (of course this could be personal/attitude issues with the individual I'm trying to reach but it seems to be common).
simply put a lot of people under 35 don't talk on the phone which can resolve problems quicker then 2 hours of texting in circles.