More coming soon …
# — The hashtag symbol helps categorize Tweets by keyword – words preceded by the # symbol are grouped with other Tweets containing that same #word. The hashtag is a popular method that was created and made popular by twitter users. It was not created by Twitter. Clicking on a hashtagged word in any message shows you all other Tweets in that category. Hashtags can occur anywhere in the Tweet. Hashtagged words that become very popular are often Trending Topics.
@ reply — A method also popularized by twitter users, that actually became an official feature of twitter. Users can start a tweet with @username and it will appear in the person’s replies tab.
If a twitter user sends a direct message to another twitter user by using the @ sign, other users will see the message in the sender’s tweets. Other users will not see the message in the recipient’s tweets. The recipients will see the message in their list of tweets. For example if Arlingtoncards sent an @earlyreport to earlyreport, others users would see @earlyreport on the arlingtoncards tweets, but would not see the tweet on earlyreport’s tweets.
A mention is any twitter update that contains @username in the body of the tweet. If a user (logged in) goes to twitter.com/mentions, then twitter forwards the user to twitter.com/#replies. The page shows a list of any tweets that mention the user. If the user is not logged, the user is prompted to log in.
@ Is Different from Direct Message
In addition to public updates and @replies, you can send followers private tweets, called direct messages. 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.
See also …
The Twitter Status Blog
Main page for Tweet Button, Widgets and other Buttons.
The Widget for embedding any public twitter account in a website or facebook. Widget by user name or by search phrase.