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Elon Musk will now not join the board of Twitter, the company's chief executive Parag Agrawal says.
Mr Musk's appointment was due to become effective on Saturday after revealing last week that he had bought a 9.2% stake in the social media platform.
However, "Elon shared that same morning that he will no longer be joining the board", Mr Agrawal tweeted.
The Tesla boss remains Twitter's largest shareholder and the firm will remain open to his input, he added.
Just over an hour after Mr Agrawal's announcement, Mr Musk cryptically tweeted a single emoji.
Over the weekend, Mr Musk suggested changes to Twitter Blue premium subscription service, including slashing its price, banning advertising and giving the option to pay in the cryptocurrency dogecoin.
Mr Musk also asked his more than 81m followers whether Twitter is "dying" and if its headquarters should be turned into a homeless shelter.
He also created a poll asking whether the letter "w" should be removed from the Twitter, with the only options being "yes" and "of course".
Mr Agrawal said Twitter offered Mr Musk a seat on its board as the company had believed it was "the best path forward", with board members having to "act in the best interests of the company and all our shareholders".
Addressing Mr Musk's decision, Mr Agrawal said: "I believe this is for the best".
"We have and will always value input from our shareholders whether they are on our board or not," he added.
"Elon is our biggest shareholder and we will remain open to his input."
Mr Musk is the largest shareholder in the company, with more than four times the 2.25% shareholding of Twitter co-founder Jack Dorsey.
Shares in Twitter soared by more than 27% last Monday after Mr Musk's stake was revealed.
However, many Twitter employees have felt disgruntled by the announcement that the Tesla chief executive had become the largest shareholder in the company and was subsequently invited to join the board.
According to company insiders, there was anxiety over what impact he would have on the social media company's ability to moderate content in the future.