Google said it was unable to confirm which accounts were affected by the bug, but an analysis indicated it could have been as many as 500,000 Google+ accounts. "We found no evidence that any developer was aware of this bug, or abusing the API, and we found no evidence that any profile data was misused," Google said in a blog post. It was referring to application programming interface software for the social network.

The data involved was limited to optional profile fields, including name, age, gender, occupation and email address, Google said. Information that could be accessed did not include posts, messages or telephone numbers, a spokesperson said. Google did not specify how long the software flaw existed, or why it waited to disclose it.

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The Wall Street Journal reported that Google executives opted against notifying users earlier because of concerns it would catch the attention of regulators and draw comparisons to a data privacy scandal at Facebook. Earlier this year, Facebook acknowledged that tens of millions of users had personal data hijacked by Cambridge Analytica, a political firm working for Donald Trump in 2016.

"Every year, we send millions of notifications to users about privacy and security bugs and issues," a Google spokesman told AFP. "Whenever user data may have been affected, we go beyond our legal requirements and apply several criteria focused on our users in determining whether to provide notice." The company said it determined its course of action based on the data involved in the breach, lack of evidence of misuse and whether it could accurately determine which users to inform.

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