Best chain for Twitter?

Elon has stated a desire to add a cost to post each tweet in order to reduce spam, and to prevent censorship. Both would be met by building twitter on a public and decentralized blockchain. With Doge being Elon's favorite chain, that would be the first thought. Recent updates have dramatically reduced transaction cost to a fraction of a Doge, which would meet the minimal cost requirement, but block time is still one minute, and people aren't going to want to wait that long for their tweet to post. An update could fix that, but what other non-proprietary blockchains offer sub second transaction speed, fraction of a penny transaction cost, and could handle the transaction volume?