Get deals by following companies: Some of your favorite companies might post deals to Twitter. You'll have to sort away businesses that spam followers too often, but I like following @amazonmp3, @amazongames, and @woot.
If you really want to step up your hustle, make a new Twitter account specifically for landing freebies so the spam won't get to your real one. Keep it all straight with a twitter client that manages multiple accounts, such as Tweetdeck. Also, check out "How to Win Prizes on Twitter" for more tips.
Learn about current events: Look for your local Happen.in feed, which charts Twitter chatter based on your location.
If a bunch of people in the same area post "bridge out," Happen.in will repost the details so that you keep on track of regional events and trends. The Twitter Website includes similar functionality in the right-hand column. Adjust those Trending settings to set it for your area.
Expand URLs: Shortened links could send you to a funny YouTube clip, a popular article in the New York Times, or a site designed to riddle your PC with malware. Use a Greasemonkey script (a Firefox add-on) and just hover your mouse over the cryptic URL to see the full version at the bottom of the window.
If you're in a different browser, try pbtweet or read How to Use Greasemonkey Scripts in IE, Chrome, and Safari for more details.
Texting Tips and Smartphone Secrets
Toggle mobile formatting: Many Websites detect your mobile browser and offer up a mobile version of themselves with bigger fonts and simpler formatting. If a site doesn't do this automatically, try putting m. or mobile. at the front of the Web address (URL), as in http://mobile.pcworld.com.
If you want to swap a mobile site into its full, PC design, look for a link at the top or bottom of the page.
Get e-mail as texts: You can have email messages sent to your phone as texts, which can be convenient. Maybe your RSS reader can forward content as e-mail, and you want to be alerted to updates in a rarely used feed.