After you paste a link to a status update, Facebook will show you a preview of the it. Once the preview is there, you can delete the link text from the status update and the link will stay attached to the post. This keeps your status updates short and clean without having to show those long, ugly links.
If there is more than one graphic available on the webpage you are linking to, you will have a choice of thumbnails to use with the article. Click on the arrows on the top right of the thumbnail to see the selection. If you don’t like any that are offered or they just don’t fit the article, you have the option of uploading your own image instead.
You also have the option to change the headline and the text preview of the link. This is helpful if you want to highlight a specific part of the article. All you have to do is click on them and the text will become editable.