Americans woke up on the last day of 2016 to a message from President-elect Donald J. Trump wishing them a happy new year.
But the holiday missive, posted on Mr. Trump’s official Twitter account around 8 a.m., came with a pointed jab.
“Happy New Year to all,” Mr. Trump wrote, “including to my many enemies and those who have fought me and lost so badly they just don’t know what to do. Love!” (Some social media users homed in on Mr. Trump’s use of the word enemies, rather than opponents or another word for those who oppose him.)
Even a holiday known for its good cheer, it seems, could not dull Mr. Trump’s penchant for doling out taunts and insults via Twitter.
The social media site remains one of Mr. Trump preferred channels for communicating with the public, and he has consistently used it to make statements that have upended news cycles.
One of Mr. Trump’s messages in December, about the United States’ nuclear arsenal, incited a cascade of speculation, as his words about a topic of considerable gravity were parsed and analyzed.
Questions have been raised about how the news media should cover Mr. Trump’s use of Twitter, with some people noting that, whether by design or not, the messages divert attention away from other events.
On Friday, the news was dominated by reports and analysis related to President Obama’s decision to strike back at Russia for its election-related hacking by, among other things, expelling 35 Russian diplomats and their families, as well as by the rift that has come to the fore in recent days between the Obama administration and the Israeli government.
“Great move on delay (by V. Putin),” the president-elect wrote. “I always knew he was very smart!”