The word “tweet”
Despite only being founded in 2006, Twitter has been involved in a long and strenuous battle to obtain the trademark forthe word “tweet.” The company had been attempting to secure the trademark since 2009, but were turned away because it was already owned by the third-party advertising company, Twittad.
However, though not legally awarded by the board, Twitter did gain ownership after settling with Twittad for an undisclosed amount (read: a boatload of money) in 2011.