Keyboard Shortcuts for Twitter? These are great!

?           Opens a pop-up containing keyboard shortcuts.
n          Opens up a dialog box to post a new status.
r           Replies to the tweet that is selected.
t            Retweets the reply that is selected.
m         Sends a direct message to a user.
/           Takes you to the search box
.            Moves you back to the top of the page and updates your feed.
g + h  Takes you to your Twitter home page.
g + r   Takes you to your Mentions (NOT Messages)
g + m Takes you to your Direct Messages.

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Source: MakeTechEasier