Worldcoin was recently 51% attacked, but has now been fixed by RealSolid the developer of MCXNOW.com.
The culprit has also been caught. Details in the link below.

http://www.worldcoinfoundation.org/news/confirmed-51-attack-double-spend-attack-worldcoin

http://pastebin.com/s6gMwLRg



P.S. MCXNOW feeshares are now being sold to the public, get them while they're hot!