why FaceBook is suddenly so popular

It was really surprising the way Face book has picked up. Now, it is something like essential for many individuals to scrap on Face book. What and Why it makes so popular. There are many "One to  Many chatting places. It has good feature like knowing what is in the mind of your friends and also status. Face book tools like Games are making friends online. Apart from that easy user interface and security features are improved in the recent past. It has become like Know for Friends and status for many. One more thing is you can comment on Friends activity