San Francisco (AFP) – Advocacy groups on Friday launched a campaign to stop Elon Musk from buying Twitter as the proposed purchase cleared review by US antitrust authorities. Twitter said that the deal for Musk to acquire the company was a step closer to being sealed with the passing of a deadline for it to be challenged under a US antitrust law. The Tesla chief’s $44 billion deal to take the one-to-many messaging platform private still faces review by other regulators and must be approved by shareholders. A “Stop The Deal” campaign launched by a coalition of nonprofit groups aims to stop the …