Mark Zuckerberg is once again on the hot seat for Facebook’s handling of sensitive user data after a trove of documents were released showing the CEO toyed with shopping the data — just for kicks.

A Tuesday report revealed that its billionaire CEO considered shopping user data to third-party developers in an attempt to evaluate the “real market value” of Facebook’s treasure trove of information.

Zuckerberg reportedly mulled the possibility of negotiating 100 deals to sell data in order to learn “what developers would actually pay” without actually “doing deals themselves,” according to NBC News.

The report, based on 4,000 internal Facebook documents between 2011 and 2015, including emails and webchats, shows that the social network spent years debating the merits of shopping the user data — despite Zuckerberg’s public insistence in 2009 that Facebook would never sell user information without their consent.

Though Facebook ultimately decided to not pursue that course of action, Zuckerberg’s willingness to entertain the idea led Facebook’s director of product, Doug Purdy, to describe him as “a master of leverage,” according to the report.

The documents are from a California court case involving bikini-photo-finding app Six4Three, which let users find photos of their friends in bikinis and bathing suits by searching their “friends” on Facebook.

The app acquired the files after it sued Facebook over the social network’s more restrictive privacy policies in 2015, which led Six4Three to shut down the Pikinis app.

The lawsuit had been quietly progressing until recently when documents were seized by Britain’s Parliament in November ahead of a hearing looking into disinformation and “fake news.”

They were then anonymously leaked to British journalist Duncan Campbell, who gave them to NBC.

Facebook, for its part, called the collection of documents “cherry picked” and said they were “selectively leaked.”

“The set of documents, by design, tells only one side of the story and omits important context. We still stand by the platform changes we made in 2014/2015 to prevent people from sharing their friends’ information with developers like the creators of Pikinis,” Facebook deputy general counsel Paul Grewal said in a statement.

“The facts are clear: we’ve never sold people’s data,” he said.

Shares of the social network were falt Tuesday at $179.86.