Internet friendships no matter how long they endure can not be allowed to proceed beyond certain levels. Personal information should never be freely handed out to internet friends, who, regardless of how long you think you may have known them, may not be the person you think they are.
Even if you blog, and they make inquiries of a personal nature, the purpose of such could be to bring you down, embarrass you.
Access levels should be assigned, and those that do not qualify, kept in the dark, about personal information, no matter the topic. It is sad, that such measures must be taken. It does indeed seem a dog eat dog world.