The amount of malware spreading on phones and tablets continued to surge this year, rising 22 percent over 2010 in the first half of 2011, according to a . Android came under fire--surpassing Symbian and Java ME as the most attacked mobile operating system, according to the study--with a 76 percent jump in malware from the first quarter of 2011 to the second. Android became the target due to its open nature and its large market share (43 percent in the third quarter of 2011, according to Nielsen).

Mobile infections will continue to rise in 2012--especially on Android products--as the population of devices increases further. Mobile malware often spreads via app stores, posing as a new app or as a look-alike of a well-known app. Third-party app directories usually contain more malware than official app stores do, so stick with the latter. Even then, examine user reviews and do research before you download, especially in the case of new apps. Also, install an antivirus app such as for Android, BlackBerry, iOS, and Windows Mobile, or for Android and Windows Phone 7.

As for other mobile threats, pay attention to Wi-Fi security when using wireless hotspots at restaurants, airports, hotels, and other public places. Tools such as the make it easy for people to eavesdrop on your activity while you're using Wi-Fi. The tools enable any attacker--or even just a curious Joe--on the same hotspot to capture your logins to Facebook, Twitter, and other sites that don't automatically use SSL encryption.

To deter eavesdroppers, instead of using apps to access accounts on mobile devices, go to them directly through your Web browser (at least when you're using a public hotspot). Make sure the site URL begins with https instead of http. If it doesn't, try adding the s. Even better, check your account settings to see if you can , a feature that is now available for Facebook and Twitter.