You can now add Bluesky and Mastodon your organisation’s social media accounts in organisation settings organisation details. This adds corresponding buttons to News Builder footers and lets you insert the new social media links into templates with {insert: social media ...} substitutions.

Also, these two services are included in the list available to add to member individual’s additional handles (using @+ after an individual’s email address; you can add additional services anyway, so this just saves that step).