"User-generated content (UGC) is defined as \"any form of content such as blogs, wikis, discussion forums, posts, chats, tweets, podcasting, pins, digital images, video, audio files, advertisements and other forms of media that was created by users of an online system or service, often made available via social media websites\". It entered mainstream usage during 2005, having arisen in web publishing and new media content production circles."@en .