On June 7, 2018, Facebook introduced that a bug had resulted in about 14 million Facebook customers having their default sharing setting for all new posts set to "public". In many countries the social networking sites and cellular apps have been blocked temporarily or permanently, including China, Iran, Vietnam, Pakistan, Syria, and North Korea. In May 2018, the government of Papua New Guinea announced that it might ban Facebook for a month while it considered the impact of the web site on the nation, although no ban has since occurred. In 2019, Facebook announced that influencers are no longer in a position to promote any vape, tobacco products, or weapons on its platforms. On October 11, 2017, Facebook introduced the 3D Posts characteristic to allow for uploading interactive 3D belongings. On January eleven, 2018, Facebook introduced that it might change News Feed to prioritize associates/household content and de-emphasize content from media firms. Facebook used a mix platform based on HBase to store data throughout distributed machines.