Straight from their announcement https://www.blog.google/technology/safety-security/project-strobe/ https://www.blog.google/technology/safety-security/project-s

Straight from their announcement https://www.blog.google/technology/safety-security/project-strobe/ https://www.blog.google/technology/safety-security/project-s... > We made Google+ with privacy in mind and therefore keep this API’s log data for only two weeks. That means we cannot confirm which users were impacted by this bug. However, we ran a detailed analysis over the two weeks prior to patching the bug, and from that analysis, the Profiles of up to 500,000 Google+ accounts were potentially affected. Our analysis showed that up to 438 applications may have used this API. > 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.