SkyDrive is now OneDrive, and SkyDrive Pro is now OneDrive for Business. Read more about this change at From SkyDrive to OneDrive
You can post to the public newsfeed to start a conversation that everyone in your organization can see. You can add a variety of features to a post, such as a picture, #tag or @mention, and links to documents, websites, and videos. Anyone who sees your post can reply to it. People who are following you see your post in their Following view as well as in their Everyone view. People who aren’t following you see your post only in the Everyone view of the newsfeed.