Fourth Amendment of the US constitution

Does the Fourth Amendment apply to computer (technology) search and seizure? When should computer search and seizure be permitted? When should it not? Does it matter if the technology is a home or a work device? What about when the government needs help (e.g. iPhone)? Recent WikiLeaks (March 7 2017) documents show that the CIA &/or hackers are monitoring people.
Where do you place adult sexting – a minor ethical violation, a serious ethical violation, or a very serious ethical violation? What circumstances – consequences, society’s opinion, likelihood of effect, time to consequences, relatedness, and reach of result – might move adult sexting from a minor ethical violation to a serious ethical violation and then finally onto a very serious ethical violation? What would you do if you found a colleague was sexting during the workday?