I am on Twitter, but from what I read, you can send someone a so-called 
Direct Message only if that person is following you (you have to have a 
Twitter account, of course). At least according to the Twitter Help 
resources:

http://help.twitter.com/forums/10711/entries/14606

Private Twitter Messages

In addition to public updates and @replies, you can send followers private 
tweets, called direct messages, too.  If someone is following you, you can 
send a direct message from the web via the "message" link on the profile 
page. (please note: you cannot send a direct message to a user who is not 
following you.)


Marilyn

----- Original Message ----- 
From: "Don Wiss" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, February 06, 2010 12:38 PM
Subject: anyone on Twitter?


> As we all know Ray Audette has disappeared. I was thinking of ways to 
> track him down. His co-author, Troy Gilchrist, could be one way. But there 
> are 17 in the phone book. Then there is his son! I find that his son is 
> now old enough to have a Twitter account:
>
> http://twitter.com/GluoN8
>
> Now it isn't very active. If there a way for a Twitter subscriber to 
> contact another Twitter subscriber?