Why is it necessary to manually enter a message for Facebook when using the Browser Extension?
Buffer's Browser Extension automatically grabs the page title and the link, which you can use to customize your post for Twitter, LinkedIn, Google+, Pinterest and Instagram. So why doesn't it pull it in for Facebook? Great question!
Facebook rules stipulate that third party apps, such as Buffer, cannot auto-fill the text update for a post on behalf of users, which means users need to directly input what they'd like to share. We're so sorry about this limitation. We're keeping a close eye on Facebook's guidelines to see if this changes in the future.