We have a friend who passed away in February from lung and brain cancer. His FB page is still "active" with friends posting memorials and, today, birthday wishes. Every now and then I get a reminder from Facebook to "reconnect" with him. I am assuming his mom or other family member manages the page b/c "he" has recently accepted new friends. Would you post on a friend's page who has passed away? The memorials and pictures I understand. The birthday wishes are a little morbid to me.
ETA: I am not trying to belittle anyone who uses this type of rememberance to cope with their loss. This is the first time I have ever experienced a "sad Happy Birthday" and, thus, the reason for my post.