If I could go back in time I would stop the assassination of Archduke Franz Ferdinand. No assassination no WWI, no WWI no WWII, no WWII no need to break German military ciphers, no need to break German military ciphers no breakthroughs in computer science by British government, advances in computer technology take a hit. Also, no WWII no Cold War, no Cold War no ARPANET, no ARPANET no Internet, no Internet no Facebook.
No Facebook + a lack of computer technology = I don't have to see lame Facebook updates, nor do I have to rant about it.