From The Guardian:
Last year, “culture” was the dictionary’s top word; this year, socialism sparked “intense” curiosity, with an increase of 169% in look-ups compared to 2014, according to the dictionary. “Socialism has been near the top of our online dictionary look-up list for several years,” said editor-at-large Peter Sokolowsk. “However, this year look-ups for socialism moved up even further, beginning with the July campaign events for Bernie Sanders, remaining high throughout the following months and spiking again after the first Democratic debate in October.
Google searches for libertarianism peaked in 2012 with the Ron Paul campaign: