In my opinion stay away from ppc sites ,most of them are scams. I sign up with loads of pay per click sites but in few months time I realised it is just a waste of time as they pay part of penny. I was able to collect hardly $1 in a month. Firstly they pay 1p/c for 5 to 10 adds view. And they send 5 to 10 adds a day so 1pence/cents a day earning is not good enough for your precious time on net. Apart from that some add sites are spaying on your computer or might have virus. Some add site try to download screen saver or in other words not good for your machine. Most of the site when I reached to minimum payout of $2, $3 or $5 after 4 months of hard work did not pay . They even did not reply.
Most of them are scams