Hi all. I haven't understood yet: I can see the tweets of a following person... But if I answer to them and I'm not followed by this person, can he see my answers?
if you put @username in your tweet it will be directed to that person into their mentions area so they can see what you have replied and not have to be following you back, but if you do not add the @username and they are not following you back they will not be able to see your reply
Yes, the person can see your tweet / reply even if you are not follwing him or he is not following you. You just have to mention his username (preceeded by @) Or you can simply go to person's wall and tweet there...