in his blog post samidh chakrabarti also said social media enables people to live in echo chambers.dig in. >> that's right. we have to get ourselves out of the echo chambers facebook can't do it for us. >> meaning we just read people who agree with our biases and opinions. >> people challenging us. great. thanks. >>> neil diamond, a recording star for more than 50 years, says he's done with concert tours. the singer/songwriter made the surprise ann night. he revealed he's been diagnosed with parkinson's disease. vladimir duthiers of cbsn has more on the impact of diamond's retirement. >> reporter: good morning. versary to australia and new zealand in march, but diamond canceled the concerts because of the onset of parkinson's, a disease for which there is no cure. ♪ after five decades of playing to a crowd, neil diamond says he will no longer tour because of the neurological disorder parkinson's disease. on wrote, "it is with great reluctance and disappointment that i announce my retirement. sincerest apolo everyone who purchasedtickets." ♪ coming to america ♪ diamond has soeltdld m