In Twitter, the number sign is called a "hashtag" and it's used as a way of grouping or categorizing tweets, as Twitter does not have that functionality included. So, for instance, during the presidential debates certain hashtags were set for everyone to use in their tweets when discussing the debates.
This allows you to go to Twitter Search, search for the hashtag and then follow all comments that include it. So in real time, you can follow the comments and respond to them, creating a conversation about a given topic.
Others use them to denote discussion of events, groups, TV shows, movies, themed discussions, world events, and more.
It also tells you that its on twitter.
You can use TwitPic (see related link) and sign in with your twitter account.
Twitter is indeed free to sign up and use. The company thus far has made no statement of adding a premium/paid service. So don't expect to ever have to pay to use Twitter.
You can't use the same email address again.
Sign up for a program such as twitpic. You can Google it and sign up, and then it will give you a number that you can send pics to and it will post them as statuses on your twitter profile.
Now they have a new Twitter homepage which is kinda like Facebook's. You just go to the corner and click "Sign in" and then just type in your username and password.
Type your twitter username and password and then click on "Sign in".
Usually this will only happen if you have violated Twitter's terms of use which you agree to when you sign up.
Do you mean how do you get on Twitter by any chance? Use this link below and it will give you the option to sign up for it! https://twitter.com/
Do you mean how do you get on Twitter by any chance? Use this link below and it will give you the option to sign up for it! https://twitter.com/
Yes this is possible. You can sign up via text message. Follow the related link below for instructions in Twitter's Help Center on how to do this.
Yes You can use the email that you used to sign up with.
This is the syntax they chose to identify a twitteruser.