I think Mark Zuckerberg should find a way on how to determine that a Facebook account owner is still alive. Perhaps there should be another status (besides single, married, divorced etc) to indicate whether the person is still living and breathing or has deceased.
If he can't find a way to find it through his million lines of codes, then, why not provide a facility for the siblings or parents to apply for the status to be changed from Alive to Deceased?
One of my Facebook friends, passed away in early 2010, her FB account was set with high security and no one can write on the wall. Until today, the wall is still very much active because there are some of her friends who still tag her in photos and FB notes.
Yesterday (Saturday) was my late brother's birthday. I saw some of his FB friends wished him Happy Birthday and 'Selamat panjang umur, murah rezeki'. I believe these people knew him through the internet, and it's been awhile since they communicated. Luckily few of my relatives noticed the messages and later they posted on his wall to announce that he has passed away.
I was not feeling offended, but it's just sad to read people wishing your sibling 'Selamat Panjang Umur' when he has already left this world. As a Social Network user, I think we should also be more sensitive by checking the person's recent activities before wishing them Happy Birthday or even Happy Anniversary. You'll never know, some couple that might have divorced, maybe forgotten to change their Status or Anniversary Date in their profiles. So, sometimes, it's not that bad to keep updated with latest gossips.