My first thought on this is that email and social media involve two or more people. By requiring access to email and social media accounts of people on parole,

My first thought on this is that email and social media involve two or more people. By requiring access to email and social media accounts of people on parole, probation or supervised release, they also get access to emails and social media posts of people who are NOT on parole, probation or supervised release. The people who send or receive email to parolees haven't signed any consent to give up their Fourth Amendment rights.