Then, in August, it was made available to everybody who uses the US English language.
Finally, this Monday, Facebook announced that from now on, Graph Search will include posts, status updates, photo captions, check-ins and comments (still only for US English users).
These new changes are being rolled out slowly to a small group of people who currently have Graph Search and Facebook says they will take in consideration the users' feedback before extending the changes to all Graph Search users.
"As with other things in Graph Search, you can only see content that has been shared with you, including posts shared publicly by people you are not friends with," they shared, and urged users to use privacy shortcuts and Activity Log to review who can see the things they share."
Think about it: everything you wrote and haven't restricted the viewing of to the persons you wanted will now be searchable and viewable to random people. In fact, Facebook Graph is likely to be a phishers heaven.
Shortly after Facebook Graph was introduced, we wrote about its privacy implications and the threat it poses for enterprises and private individuals, and all the warnings are still valid, so I suggest you check them out.