This is one of the indicators of whether a source is credible or not. Traditional newspapers always include an original publication date and a "last updated" da

This is one of the indicators of whether a source is credible or not. Traditional newspapers always include an original publication date and a "last updated" date, along with notes—such as an "Editor's note" or "Update"—to indicate factual corrections or major changes to the article. What qualifies as a major change can be subjective at times: there have been controversies where newspapers change an inaccurate headline without notice and larger controversies where there is a "stealth edit" that many readers believe should have been publicized. But this expectation that there should be transparency with edits should be the norm. I believe that articles on personal websites and blogs can only gain by following the practice, too, as it's an indicator to the reader that the author cares about transparency and accuracy.