I hate this kind of thing. By "keeping a memory alive", and revisiting that memory every day, I feel you can't get past grief, and move on with your life. Parents who keep a shrine, friends who keep facebook pages going forward - are you actually moving through your life?
The person is dead. They don't care anymore about Facebook. Let them fade, remember the good times you shared, and move forward. Honoring someone's memory doesn't mean canonizing them. If that person was the only thing keeping a group of people connected, then their absence means that the group should drift apart and move on - that's how humans should work.
All these sorts of things do is keep a wound open and fresh. Keep a page up for maybe a short time for those people who can't attend the funeral/wake/whatever ceremony you have, then gracefully remove the page.
Just because we can, doesn't mean we should.