to write on someones facebook wall using your mobile you would do it like you would if you were on the computer/laptop
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unless you are on a discussion wall / a mutual friend's wall, you cannot like someones comment or status
If you click on their wall a small box should be at the top where you can type and then you click send and it appears on there wall
When you send a message on Facebook, your message is private between you and the recipients. It will not appear on the recipient's wall.
I believe so yes but if you both block each other then neither of you can see each others wall
If you compose a message from your Inbox then it is private. If you post something on someone's wall it is not.