If you need access to someone’s Facebook profile this is how to accomplish that task.
Set up an appealing Facebook account, then request to be friends of some people friended by the subject. Wait until some of them accept your friend request. With mutual friends in hand, request to be the subject’s Facebook friend. The subject will see that you have mutual friends and he should accept you as a friend. Then you have access to his profile, photos, postings, and perhaps you may find what you need. However, there are a few legal issues to consider.
If you are an Investigator, and your subject is represented, then asking permission to see his or her page is contact with a represented litigant. In Canada, if the opposing litigant is represented by council, then you may not contact him or her in person, by telephone, or electronically. In most cases you have to ask to be listed as a friend to view the subject’s Facebook page. Doing this will be considered improperly making contact with the litigant and whatever you find will be deemed inadmissible.
However, what you find in Google, other search engines, and unrelated Facebook pages may be used as the basis for a motion for the production of the subject’s entire Facebook page as happened in KOURTESIS V. JORIS (2007) O.J. No. 2677 (Sup. Ct.).