i cannot open my facebook in my iphone 4s ..do i need to update the iOs 6.0 ?
Yes. Connect to the computer you usually sync with, open iTunes,
on the summary page, click the button saying 'Check for Updates'.
can i update the iOs 6.0 ?
do i need to update the iOs 6.0
If you're runnning an iOS older than 4.3, yes, as FB app requires 4.3 or later.
You dont have to,but can if you choose to. If your having an issue with the app, you can always delete it and redownload it to see if it remedies the issue.
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