Her personal and verified page -- not the account she inherited as the President's wife -- liked the tweet, "Seems the only #wall @realDonaldTrump's built is the one between him and @Flotus."
Left-wing blogger Andy Ostroy penned the original tweet at 9:15 PM yesterday, alluding to President Donald Trump's proposed border wall with Mexico, the New York Daily News reported.
The Twitter post included an animated image of Melania's beaming smile she flashed for the president, but quickly reduced to a scowl as he turned away during the January inauguration.
It was only the second tweet the first lady's currently- inactive personal account had liked.
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Its last tweet was on November 8 last year, the day of the US presidential election, and featured an image of a "Vote #TrumpPence16" badge. Its other "liked" tweet was its own first message, a simple "Hello Twitter!" in 2012.
The Twitterati, however, had a field day over the post.
"We have a glimpse of what her life must be like," one person said.
It was not clear if Melania actually liked the tweet herself, or if the account was hacked.