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Is there a way to install various communication software like Skype, Tango, Whatsapp etc such that my normal phone contacts are not affected?<br />
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Whenever I install one of these software I get multiple entries of each of my contacts and they do not go away even if I uninstall the software and I have to manually manage them.
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Is there a way to install various communication software like Skype, Tango, Whatsapp etc such that my normal phone contacts are not affected?

Whenever I install one of these software I get multiple entries of each of my contacts and they do not go away even if I uninstall the software and I have to manually manage them.

Android contacts

Smartphones run using a variety of operating systems -- Android, iOS and Windows Mobile most commonly -- and an even wider variety of programming languages, including Objective-C, Java, Visual C#, C++ and .NET, not to mention HTML5 and JavaScript, and cross-platform frameworks such as PhoneGap.

Smartphone Programming

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).