The hashtag #5secondsofsummer trended worldwide for the first time on Twitter.
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Justin Bieber reached one million followers on Twitter.
Donald Trump was permanently suspended from Twitter due to the risk of further incitement of violence.
Elon Musk bought a 9.2% stake in Twitter, amounting to $2.9 billion.
Chris Messina Tweeted #barcamp, which became the first use of a hashtag on Twitter.
Twitter was launched to the public.
