Wordlinx

Wordlinx is one of the oldest ptc sites on the Internet. It is registered in 2003 and it has more than 131.000 members.

There are 2 types of accounts:

Standard (free) and Premium(paid membership).

As a standard member you can earn $0.01 per click and $0.005- $0.01 for every advertising email you read.

Also you receive 5% of your referrals earnings (for premium account is 10%).

The payment is made through PayPal at a minimum amount of $10.

Advantages:

you can bring as many referrals as you can;
you can buy packages of referrals;
there is a $0.05 bonus for each referral you bring in the system;
you receive 5% of the money your referral invest in the system (refs purchases);
you get $0.05 for each referral that upgrades(for 3 levels deep);

Disadvantages: