No.
No
To message people on Twitter, you must have an account.
Yes you can direct message to your twitter contacts from the Message section.
Only if they go on your profile and notice that the message option isn't available anymore.
While you can only "direct message" people on Twitter who are following you, you can try to get someone's attention by referring to their user name and adding the @ symbol prior. For example @DavidWallace which is my Twitter user name would show up in my "replies" box in TweetDeck which is what I mostly use to access Twitter.
As of March 17,2011 8,202,406 people are following him on twitter
It Depends On If The Person Have A Privacy Lock On Thier Account.. People Who Block They Page So Only The People Who They Are Following And Getting Followed Back Can Communicate. If The Person Account Is Not Locked You Can Send Them A Message And A Tweet.
Yes they do. But sometimes he doesn't answer.
At the top right hand corner it tells you how many people you are following and how many people are following you. If you click on those that are following you, they are in order of when they started following you. So, the one at the top is your most recent follower.
By typing their username (@username) in your tweet.
I think you can follow someone on Twitter if you have 900 K people already. It should not matter how many people you are following or who is following you.
Yes, you can see how many people are following a Twitter account. All you have to do is go to the person's profile and look at the "Followers" amount.
Type @username (their username) then your message and then click send. Your message, or tweet, will then appear in the person's mentions tab.