Donald Trump has claimed that America was "great" back in the early 20th century and also in the 1940's and 1950's (see here)(and here)
I will not go into why he thinks those years were the greatest for America, but I can tell you one thing that did not exist at all back then: Twitter.
Twitter began in July 2006. According to Donald Trump, America at that time was not great at all. The best I can sense is that Trump believes that America has gotten worse during the time of Twitter.
So, Donald Trump, I dare you: live up to your goal of "make America great again" and stop using Twitter.