Since October last year, variations of this hashtag word game have sprung up on Twitter, most recently due to the "#HashtagWars" segment of the Comedy Central late night show @midnight.

This abbreviation of the word "okay" is often considered a dismissive or uninterested reply in text messages and online communications.

Around 2,000 teenagers attended a party at a mansion thrown by a 17-year-old who promoted the event via social media with the hashtag #MansionParty, resulting an estimated $70,000 worth of damage.

This deceptive practical joke fools a target into thinking an innocent bystander slapped the back of their head unprovoked.

YouTube comedian Jon Lajoie begs companies to use his song in their commercials in his latest music video "Please Use This Song."