There are three (3) sets of keyboard shortcut provided by Twitter operating system for Twitter users to make use; Actions. Navigation, and Timelines. For hyper-user who really focus on monetizing Twitter with more than 100 tweets per day, this information is very helpful.
Actions
f : favorite
r : reply
t : retweet
m : direct message
n : new Tweet
enter : toggle details pane
Navigation
? : this menu
j : next Tweet
k : previous Tweet
space : page down
/ : search
. : refresh Tweets and back to top
Timelines
g h : home
g r : replies / mentions
g p : profile
g f : favorites
g m : messages
g u : go to user