This is your sticky post home page content. You may edit it at Posts > Home Page.
About My Site
This is the new Author Box widget. Your gravatar.com image will automatically be placed here if your blog/site email address is on file there. You can change your site email address at "Users > Your Profile > Email".
To enable the social sharing icons, enter your Twitter, Facebook, Google+ and Linked-in page urls under "User > Your Profile".