How to Use "observer" with Example Sentences

1. Facebook joined in may but only as an observer .
2. Yevgenii zhovtis , kazakhstan 's best-known human-rights activist , was one such hopeful observer .
3. Except the observer was not talking about blackberrys or solitary video watching .
4. So why is one professional observer so negative about america 's short-term economic prospects ?
5. Nato says the meeting could take place early next week and that russia will not attend in its observer status .