An internal review by BuzzFeed last week found three instances when editors deleted posts after an advertiser or employees from the company’s business side complained about their content, according to a memo sent to staff members on Saturday by the news and entertainment website’s editor in chief.

The three deleted posts — out of more than 1,000 expunged for other reasons, according to the memo — had criticized products or advertisements produced by Microsoft, Pepsi and Axe body spray, a Unilever product. In the memo, the editor, Ben Smith, wrote that they were “pulled after an editor fielded a complaint from a business-side BuzzFeed staff member who worked with a brand mentioned in the piece.”

The disclosure about the reasons for the deletions came four months after BuzzFeed unveiled editorial guidelines meant to highlight its continuing attempt to transform from a creator and aggregator of viral web content into a digital news organization. It also followed an admission this month by Mr. Smith that he had ordered editors to delete two other posts critical of BuzzFeed advertisers: Dove soap — also produced by Unilever — and the toy manufacturer Hasbro.