Microsoft has tweaked its Bing iPhone app with a couple of new features, just in time for this week's debut of the iPhone 4.

Taking a page from its browser-based cousin, the updated Bing app can now tap into your social networks to deliver relevant search results. Bing's new version 1.2 lets you connect to your own accounts on Facebook and Twitter to access the last six months' worth of updates from your friends and family.

You can search your social networks directly for specific subjects or names, or include them in your overall search results alongside the usual links to Web pages. To use the new social feature, you'll need to enter your Facebook and Twitter credentials. Bing will take several minutes to grab all the updates from the past half year.

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