The three posts deleted under pressure from the company’s business side were removed before BuzzFeed published its editorial guidelines, and they were a small fraction of the 1,112 deleted posts identified by an internal review committee. The majority of those were not posts produced by the editorial department, or were removed because of what the review called “technical error,” according to the memo.

The three posts linked to advertising were deleted for different reasons, including the appearance of a conflict of interest and perceived bad taste, according to the memo.

One post, written in 2013 by Mark Duffy, BuzzFeed’s former ad critic, criticized a campaign for Axe body spray and was deleted after an unnamed advertising agency complained that it had accused the company of advocating “worldwide mass rape.” In the memo, Mr. Smith wrote, “I agreed that this was way outside even our very loose standards of the time.” Mr. Duffy was later fired from the company.

A second post, about Microsoft Internet Explorer, was written in March 2013 by Tanner Ringerud, a former business-side employee who had moved into an editorial role two months earlier. It was deleted after BuzzFeed’s chief revenue officer complained that Mr. Ringerud should not have written it because he worked on a Microsoft ad campaign in his previous job with the company, creating the appearance of a conflict of interest, the memo said.

BuzzFeed deleted the post, which Mr. Smith said inspired the company to institute a “cooling off period” for business-side employees who move into editorial roles. During that period, they are prohibited from writing about brands whose ad campaigns they had worked on in their previous jobs.