Headlines and Titles of Works

Q. On social media platforms, where italics are not an option, what do we do with book titles or other titles that would normally be italicized?

Q. Not actually a question but a comment on one of your recent answers, regarding type style for book titles on social media platforms. You left out a common and I think preferable option: to use leading and trailing underscores (e.g., _A Tale of Two Cities_). Some software (such as Slack and WhatsApp) already converts text with that form to italics, and readers will so understand it even on platforms (such as Facebook) that do not yet do so.