Twitter / GeekWireA burst of exciting news flooded social media today: Mark Zuckerberg and his wife Priscilla Chan are expecting a baby! Most people were extremely happy for the new parents-in-waiting: @mashable congrats to those two. Kids add spice to anyone's life. — Keyser Söze (@KeyserSoZe__1) July 31, 2015 @CNBC Congrats to them!! We're all eager for our future to unfold. :) — Stephanie JOY Smith (@FreedTV) July 31, 2015 Facebook / MashableFacebook / MarketwatchSome people, though, were determined to spew nastiness: @MarketWatch thats a ugly couple man. — TRaderFX (@Ordusesi) July 31, 2015 @CNBC these two creep me out… — R.G. Brewski (@Rocco_JG) July 31, 2015 Facebook / MashableFacebook / MashableFacebook / MarketWatchWhile at least one person was pretty concerned for some reason: How will Mark Zuckerberg juggle parenting and running a company at the same time????? — Cooper Fleishman (@_Cooper) July 31, 2015 And then, somehow, the anti-vaxxers get involved (??): Facebook / MashableWho knows. Anyway, Good luck to the new mom and dad!!!