Each year, Oxford Dictionaries chooses a Word of the Year. For 2016, the 'Word of the Year was 'post-truth'.
'Post-truth' is the idea that it is easier to influence public opinion with messages that appeal to emotions, belief and prejudices than it is using facts. It is an idea that has been around for awhile, but was brought to a head in 2016 during the Brexit vote in the UK and the Presidential election in the USA.