Facebook has a feature to share links. On the main homepage there is a Share Link tab at the top. You paste your link and can write some text that will be displayed above the shared link.
I noticed that when many other people share their links, they get some text from the article displayed next to the picture (in grey). However, when I share my Blogger blog, I just get the blog url (buczekmruczek.blogspot.com in this case). How can I get more content in there? Why url's shared by others get more information?