I think,
One of the most meaningful idea that the Facebook brings is..
let people to stay connected with our friends,
even when they have started a new journey in another world.
This keeps us from forgetting about our friend and the good memories too soon.
This revitalizes some deep emotion connections that always get worn out too quickly in our hectic life overwhelmed by work and stresses.
And most importantly, it shows that, one is not alone.
We all try to slowly convert the painful loss to a sublimed reminisce of our dear friend.