By Kirk Miller Elon Musk went on Twitter recently to complain about Twitter — and later suggested it might be time for an alternative to the social media platform. On Friday, the Tesla founder posted a poll on Twitter. “Free speech is essential to a functioning democracy,” he wrote. “Do you believe Twitter rigorously adheres to this principle?” He also suggested that “the consequences of the poll will be important,” and given his prior history, Musk may actually mean what he says — after all, it was a Twitter poll in November that convinced him to sell some Tesla shares. Unsurprisingly, his fa…