[philippotto]

In the video it wasn't "a button to share some link" but it was a feature to search the social media and embed content in your "document".

And even if it supports simple sharing, I don't see why this would be "totally uninteresting [there]". It would probably be more convenient than uploading a powerpoint file somewhere or creating a separate website.

/edit: OK, there are two different mentionings of social media in the video. The first is about embedding content of social media and the second is about sharing the content you created.