Facebook-a place of mourning

I recently came across the profile of a young man on facebook, who tragically died.

The reason this profile interested me so much is the fact that since his passing his facebook has been active, and his friends (one of whom is a school friend of mine), have been posting on his wall.

2 things that i had to ask myself when i found this were 1) who's been keeping his facebook active? 2)Is it appropriate?