If you want to update your status without a single word than you can do it by simple following steps.
-> Login to your Facebook account and go to the status update field
-> Now paste this or write this code in the status updating field @[0:0: ]
-> Click on the post button
-> Done! Just check your profile and you can see the blank status update.
Note : You can use 2 in stead of 0 in that code like @[2:2: ]
-> Go to the status update field
-> Hold ALT key and press 0173
-> Now click on the post
-> A blank status is updated