Dead people in social networking sites

The other day I saw my former employer's CEO's profile on linked in. The guy passed away almost two years ago due to unexpected heart attack. His profile in linked in still says he is the CEO of the company which is kind of weird. I believe those social networking sites have so many dead people's profiles in their database and those should be removed or inactivated. They should determine an inactivity timeframe or something like 2 years if there is no user activity, the account should be inactivated. Just like free email services out there like yahoo mail. I think if you don't use your yahoo email account like 2 or 3 months, it will be inactivated automatically.