To receive breaking news updates from cnn.com, for example, just follow Twitter user “cnnbrk.” Or send a message (“move car 30”) to user “timer,” and it will text back a reminder in the time you specify. Other functions are available through third-party sites: Enter your favorite RSS feeds on TwitterFeed.com, and you’ll get a text whenever the feed is updated. Send the mileage, price and gallons to fuelfrog.com each time you fill up your tank, and it will chart your fuel-efficiency trends. With i-Link home-automation software, it’s even possible to use tweets to turn on lights or open the curtains remotely (get details at hacknmod.com). Dive in at twitter.com to find more useful tricks. Of course, you can still let everyone know that you’re thinking tacos for lunch.