Accesskeys are useful ways to navigate web pages using the keyboard instead of the mouse. For introduction, check the following pages:
Accesskeys: Unlocking Hidden Navigation
Fortunately, both Twitter and Facebook use access keys for easy navigation and accessibility:
Twitter accesskeys:
0: Skip Past Navigation
1: Home
2: Skip to Navigation
3: Jump to the sidebar
h: Home
p: Profile
=: Find People
s: Settings Link
?: Help
l (Letter L): Sign out
u: Text area
>: Direct Message
n: New Result Notification
m: Reply
d: Inbox
i: Inbox
o: Send
f: Favorites
r: Retweets
/: Search
Facebook accesskeys:
1: Home
2: Friend Request
3: Messages
4: Notifications
5: Home
6: Profile
7: Account