By Uday Sampath Kumar and Chavi Mehta (Reuters) -Elon Musk took aim at Twitter with a $41 billion cash offer on Thursday, prompting a spike in shares of the social media giant, which the Tesla CEO said needs to be taken private to grow and become a platform for free speech. “Twitter has extraordinary potential. I will unlock it,” Musk said in a letter to Twitter’s board on Wednesday, which was made public in a regulatory filing on Thursday. Musk’s offer price of $54.20 per share represents a 38% premium to Twitter’s April 1 close, the last trading day before the Tesla chief executive’s stake o…

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