Facebook says it mistakenly deleted Mark Zuckerberg's old Facebook posts. "Historical" posts, such as the acquisition of Instagram, are among the posts that were deleted. Facebook also said that they won't be restoring the posts because the work to do so would be "extensive" and not guaranteed to work. But the company has made changes to the way it saves its archives of previous corporate announcements and blog posts that make it that much harder to parse the company's historical records.
If it happened to me, I'd be livid. An acquisition of a company, or just a simple memory with my buddies, was apart of my history and important enough for me to post about. I don't think it bothers him as much as it bothers me though. lol