Joe Biden commented on Donald Trump's tweets in an interview with PBS that aired Thursday.

"Grow up, Donald," said Vice President Joe Biden when asked by PBS NewsHour’s Judy Woodruff about Donald Trump's recent tweets slamming individuals and organizations.
Woodruff cited several tweets, including one that read, in part, "The Democrats, lead by head clown Chuck Schumer, know how bad ObamaCare is and what a mess they are in."
Another said, "Doing my best to disregard the many inflammatory President O statements and roadblocks. Thought it was going to be a smooth transition - NOT! "
Reacting to the examples, Biden commented, "Grow up, Donald. Grow up. Time to be an adult. You are president. You got to do something."
He added, "Show us what you have. You are going to propose legislation. We're going to get to debate it. Let the public decide. Let them vote in Congress. Let's see what happens. It's going to be much clearer what he's for and against and what we're for and against, now that it's going to get down to actually discussing in detail these issues that affect people's lives." 
While it remains to be seen if Trump changes his Twitter approach in the days ahead, his spokesperson has made it clear that the president-elect sees social media as a vital communication tool.
Sean Spicer, who will serve as press secretary for the incoming administration, told WPRI that these platforms allows the future leader to, “…put his thoughts out and hear what they’re thinking in a way that no one’s ever been able to do before. I mean, he does communicate in a much bigger way than there’s ever been before...”