Well first what you do is go on your friends facebook, and then you press comment, and then you write the message on your friend's wall.
Yes they can see a reply if they click on their @replies. That's how you get to know peeps on Twitter!
ask him on facebook or twitter, message him and post on his wall(:*
just go to their wall and click in the box at the top of the screen and when you have your cursor in the box and start typing
Yes. If you don't have a Twitter,
unless you are on a discussion wall / a mutual friend's wall, you cannot like someones comment or status
No, the information does not go to their wall until you enter it.
Compose a tweet and mention them in it.
you mean the person who's twitter you searched up? if so, they can't=]
There isn't a wall on Twitter. You can only follow & message users.
You go on a friend you want to do wall-to-wall with's profile page. Their wall should be there. Post a post that is your wall-to-wall post and send it to their wall. That's how to create a wall-to-wall.
to write on someones facebook wall using your mobile you would do it like you would if you were on the computer/laptop
A user's email address isn't supplied.