Elon Musk bought a 9.2% stake in Twitter, amounting to $2.9 billion.
Donald Trump was permanently suspended from Twitter due to the risk of further incitement of violence.
The hashtag #5secondsofsummer trended worldwide for the first time on Twitter.
Justin Bieber reached one million followers on Twitter.
Justin Bieber made his first tweet at 8:27 pm, promoting his single 'One Time.'
Chris Messina Tweeted #barcamp, which became the first use of a hashtag on Twitter.
Twitter was launched to the public.
The first-ever Tweet was published on Twitter.
