From The Huffington Post:
Professor Mizuko Ito, a cultural anthropologist at the University of California, Irvine, said discomfort with social media silence has roots in our text messaging habits…. "What you're describing with Instagram is part of this social norm that has been emerging for some time now in tandem with the rise of mobile communication, where there is the expectation of connectivity and sharing," Ito wrote in an email. "If that norm is violated, it signals something unusual or amiss.

For the full story, please visit http://www.huffingtonpost.com/2014/07/08/instagram-silence_n_5567793.html.