The phrase "a direct message of" is correct and usable in written English.
It can be used when referring to a clear and straightforward communication or statement conveying a specific idea or sentiment.
Example: "The speaker delivered a direct message of hope and resilience to the audience."
Alternatives: "a clear message of" or "an explicit message of".
"One of the positives of her visit is that she is someone able to deliver a direct message on behalf of Kim Jong Un", said Shin Beom-chul, a professor at the Korea National Diplomatic Academy in Seoul.
In lieu of an apology, Max and Frankie stage a faux funeral for Sam, and their eulogies are a direct message to all of us to get our faces out of our phones and use them to call our mothers to tell them how special they are.
The upgrades introduced today certainly emphasize the site's shifting focus to collaboration, but I feel as if the new social aspect is missing a few key features (for one, I'd like to be able to send a direct message to one of my collaborators without having to include it as part of a general discussion).
Hamilton did, however, confirm that Backstage had to lay off a couple of people and has "never had enough capital to reach our aspirations," she said in a direct message to Dan Primack of Axios.
With that in mind, I don't believe that accidentally pressing 'send to all' instead of a direct message to one is an abuse of power.
It sends a direct message to the chain of command".
With movie producer Harvey Weinstein facing mounting allegations of sexual harassment and assault, Bee used another segment to send a direct message to the "creeps of Hollywood".
I told them it is difficult to get a direct message to the President of the United States, but I promised that I would try.
— Anthony Weiner "Last Friday night, I tweeted a photograph of myself that I intended to send as a direct message as part of a joke to a woman in Seattle.
