Some apps are here today and gone tomorrow, but there are others that leave an indelible mark on the smartphone landscape.
Mobile phones are a dominant part of our tech lives these days, and the way in which we use these ever-present devices is evolving all the time.
And much of that progression is driven as much by the tools on our mobiles as the hardware on which it lives.
So from Facebook to FourSquare, we've produced a video looking at just what apps have changed the mobile world.
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