Tagging Facebook pages
Unfortunately Facebook tagging is not quite supported through Buffer just yet. That said, it's something we're working on at the moment and hoping to roll out pretty soon!
In the meantime, if you're composing a post for both Twitter and Facebook, you will be able to @ mention other Twitter accounts and when the post is shared, Buffer will convert the @ mention on Facebook to the full account name. We're so sorry this isn't an ideal workflow right now. Watch this space! 😉