Tesla Inc Chief Executive Officer Elon Musk is giving "serious thought" to building a new social media platform, the billionaire said in a tweet on Saturday.

Musk was responding to a Twitter user's question on whether he would consider building a social media platform consisting of an open-source algorithm and one that would prioritize free speech and where propaganda was minimal.

Musk, a prolific user of Twitter himself, has been critical of the social media platform and its policies of late. He has said the company is undermining democracy by failing to adhere to free speech principles.

His tweet comes a day after he put out a Twitter poll asking users if they believed Twitter adheres to the principle of free speech, to which over 70% voted "no".

"The consequences of this poll will be important. Please vote carefully," he said on Friday.