Glossary of common abbreviations from <a href="http://blog.tweetsmarter.com/retweeting/retweet-glossary-syntax-and-punctuation/" rel="nofollow">http://blog.tweetsmarter.com/retweeting/retweet-glossary-syn...</a><p><i>RT</i> Short for “Retweet.” This is even sometimes spelled out instead of abbreviated.
via Similar to HT or MRT (below), via has lately simply become more of a catchall, often seen simply as an alternative to using “RT.” But ideally, it indicates a modified tweet.<p><i>HT</i> “Hat tip” This is a way of thanking the person who brought something to your attention. It’s sometimes used interchangeably with MRT (see #3 below).<p><i>MRT</i> or MT Short for “Modified (re)tweet,” this usually indicates that you’ve edited the retweet a little, otherwise only a very small amount of editing can justify sticking with a regular “RT.”<p><i>IRT</i> Short for “In reply to” or “In response to” (or very rarely “Ironic Retweet”).<p><i>OH</i> “Overheard.” Similar to HT if attributing to a specific Twitter username. Otherwise, just another popular Twitter acronym<p><i>/by</i> The preferred method for author attribution. Sometimes used with no slash, e.g. “Great article by @user”<p><i>/cc</i> This is just a way of including another username in a tweet so they will be notified of it. It comes from the email cc standard to send a “copy” of the email to another person. “CC” originally stood for “carbon copy,” coming from the old business letter-writing standard. Also commonly used with no slash, e.g. “I love this pic [link] cc @user1, @user2″<p><i>ta</i> (British) or <i>Ty</i> (American) is slang for “Thank you” that some use: “[Tweet text and link, if any] ta @user”<p><i>QT</i> Means “quoted tweet,” favored by Japanese Twitter users.