This contest is totally fake. The basic idea of giving money for reviews is itself spoiled.
It would definitely impact reviews, would not it? I wrote reviews, I got confirmation emails and yet didnt get any money today.
I am all for sharing your reviews on social media and they really make us feel empowered. So we should share our genuine reviews on social media and why not our own social media accounts like facebook and twitter?
Coming to mouthshut: it is old website and I have wrote reviews before, but I am not coming again because the way the are fooling the user to write reviews.
They are many other reviews website that you can go and write reviews.
Still I wish best for the website and its users.:)