'for publicity purposes' is a correct and usable phrase in written English. You can use it to describe the purpose behind an action or decision. For example, "The CEO held a press conference for publicity purposes.".
When Clare was brought to London for publicity purposes on the publication of his first book in 1820, he would sit in the window of his publisher's offices in Fleet Street and watch the bustling city with wonder.
For publicity purposes, she'd then contrived to remain virginal by adopting her own child.
By entering, winners agree to their names and general locations being used for publicity purposes.
He said Shaltay Boltay could be claiming credit for publicity purposes.
"Richard Taylor is distorting commentary for his self publicity purposes," Fernando tweeted today, before stating BBC Cambridge contacted her for a comment but dropped the subject "bcz they realised [Richard Taylor] was probably misleading public".
Another three vehicles were produced for testing and publicity purposes.
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Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK