Elon Musk, Twitter Inc.’s biggest shareholder, on Saturday suggested a raft of changes to the social media giant’s Twitter Blue premium subscription service, including slashing its price, banning advertising, and giving an option to pay in the cryptocurrency dogecoin. Twitter Blue, launched in June 2021, is Twitter’s first subscription service and offers “exclusive access to premium features” on a monthly subscription basis, Twitter says. It is available in the United States, Canada, Australia, and New Zealand. In a Twitter post, the head of electric vehicle maker Tesla Inc. suggested that users who sign up for Twitter Blue should pay significantly less than the current $2.99 a month, and should get an authentication checkmark as well as an option to pay in local currency. “Price should probably be ~$2/month, but paid 12 months up front & account doesn’t get checkmark for 60 days (watch for credit card chargebacks) & suspended with …