For example, on the photo-sharing service Instagram the hashtag #bluesky allows users to find images that have been tagged as containing the sky, and #cannes2014 is a popular tag for images from the 2014 Cannes Film Festival. The media can use hashtags to collect public opinion on world events, for example searching Twitter for #worldcup2014 returns many tweets about the 2014 FIFA World Cup. Due to its widespread use, 'hashtag' was added to the Oxford English Dictionary in June 2014. The term hashtag can also refer to the hash symbol itself when used in the context of a hashtag.