How do you change your facebook so your friends can’t see when your online and can’t instant msg you?
Thanks 
On February 25, 2010,
in Social Media Experts,
by Brian Benko
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you can’t change it i don’t think.
if you don’t wanna talk to someone then delete them.
Theres a button in the lower right corner on Facebook page, right next to the ‘Online Friends’ button, after u log in, click on it, it will say – You are online – Go offline < - click on it, you’ll instantly be listed offline for your friends, while being able to use Facebook as before… Yay…
the grey bar at the bottom of the page has a button with a person and a little green dot (in the right hand corner) click on it, when the tab pops up click on the go offline link. you wont be able to see who’s online but no one can message you either.