Honestly, Google is still allowing me to opt out at any time. They (as far as we know) use "eventual deletion," but it's still deletion. Facebook on the other hand has so far retained everything that has ever been on it, according to the interview with an employee that was on HN a few weeks ago. ( http://news.ycombinator.com/item?id=1045879 )
That said, the way Buzz was introduced was definitely a leap in the wrong direction by Google.
That said, the way Buzz was introduced was definitely a leap in the wrong direction by Google.