AOL's chief technology officer left the company, while two other workers were fired in the aftermath of a privacy breach that involved the intentional release of more than 650,000 subscribers' Internet search terms, an Associated Press report said.
The report said although AOL had substituted numeric IDs for the subscribers' user names, the search queries themselves contained Social Security numbers, medical conditions and other data that could be traced to an individual.
The report said Maureen Govern, the technology chief, would be replaced on an interim basis by John McKinley, who had held that position before becoming AOL's president for digital services.
The change takes effect immediately, according to a memo AOL chief executive Jonathan Miller sent to employees.
"This incident took place because some employees did not exercise good judgment or review their proposal with our privacy team," Miller said in a second memo. "We are taking appropriate action with the employees who were responsible."
The data release was among a series of breaches involving sensitive information in recent months. Unlike those resulting from computer hacking or missing laptops, however, the AOL data had been intentionally released as part of a program to assist academic researchers, the report said.
AOL apologized two weeks ago for what it termed a mistake made by a company researcher who had failed to properly seek clearances before releasing three months' worth of search data, the report further said.