this is one of the best nepali chat website i have seen.

@magorkhei: In facebook you cannot chat anonymously with unknown people. You need to first add to friends list for which you have to send friend request and they need to add you.
Anonymosity might be one primary reason for which you use sajha to let your thoughts out and reach a specific subset of people whereas in facebook your posts will be mostly limited to your friends list even though facebook boasts of billion users.
etc...etc...etc..
note: when you are bored you can come to this chat hoping to chat with a chick.....