Australia said on Saturday it would double the maximum penalty it can impose on tech firms found to have failed to uphold a groundbreaking social media ban for children, as evidence mounts that the ban has had little effect on teen use. The government will also strengthen the information-gathering powers of its internet regulator, the eSafety Commissioner, allowing it to compel social media companies to provide evidence of what they have done to stop under-16s from getting an account. Under the...