By Uday Sampath Kumar and Chavi Mehta (Reuters) -Billionaire entrepreneur Elon Musk took aim at Twitter Inc with a $43 billion cash takeover offer on Thursday, with the Tesla CEO saying the social media company needs to be taken private to grow and become a platform for free speech. “Twitter has extraordinary potential. I will unlock it,” Musk, who is already the San Francisco-based company’s second-largest shareholder, said in a letter to its board on Wednesday. The offer was made public in a regulatory filing on Thursday. His offer price of $54.20 per share represents a 38% premium to Twitte…

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