RT 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.
HT “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).
MRT 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.”
IRT Short for “In reply to” or “In response to” (or very rarely “Ironic Retweet”).
OH “Overheard.” Similar to HT if attributing to a specific Twitter username. Otherwise, just another popular Twitter acronym
/by The preferred method for author attribution. Sometimes used with no slash, e.g. “Great article by @user”
/cc 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″
ta (British) or Ty (American) is slang for “Thank you” that some use: “[Tweet text and link, if any] ta @user”
QT Means “quoted tweet,” favored by Japanese Twitter users.
RT 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.
HT “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).
MRT 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.”
IRT Short for “In reply to” or “In response to” (or very rarely “Ironic Retweet”).
OH “Overheard.” Similar to HT if attributing to a specific Twitter username. Otherwise, just another popular Twitter acronym
/by The preferred method for author attribution. Sometimes used with no slash, e.g. “Great article by @user”
/cc 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″
ta (British) or Ty (American) is slang for “Thank you” that some use: “[Tweet text and link, if any] ta @user”
QT Means “quoted tweet,” favored by Japanese Twitter users.