Vine is the social network owned by Twitter where users can upload home made 6 second videos about anything they like (apart from porn - long story). Earlier today the Vine iOS app got updated. It now allows users to use both front and back cameras on their iPhone, iPad or iPod Touch. This makes the service brilliant for Vloggers who would just like to upload a short video of themselves saying something to the camera.
Most current Vloggers upload their videos to services like YouTube however if they don't have much to say about a topic and just want to say a sentence. The front facing camera on Vine will be brilliant for them.
Of course, not everyone in the world is a Vlogger and the average person might struggle to find a use for their front facing camera however I think it works quite well if you film something with your camera on the back and then show your reaction.
This new update also allows you to mention and hash-tag things and people quicker.