whats the difference between a blog and a bulletin?

Only friends can see your bulletins and they only last up to 10 days, before which they are deleted forever. They also tend to contain less important content than a blog.

I think anyone can see a bulletin, but only your friends get notified (but they always do). Also bulletins expire. On the other hand you have to subscribe to a blog, but you can subscribe to anyone's blog, friend or not, and the posts stay put.

bulletin is like a blog but only ur friends can see and it goes away in 10 days (kinda like a snapchat story but instead of one day its ten)