This is a very simple way to receive free soccer/football traffic, as i did this when writing sports blogs and really helped with building traffic. Goal.com is a very popular soccer website and receives loads of daily traffic. If you have the right offer, you could easily earn some money. Go to goal.com and select > International edition (the most popular section). Now scroll down to comment s and begin posting your url. Its best to send everyone to a blog thats soccer related and add some offers on your site, such as sporting event tickets or sports jersey's. I posted 8-10 comments per day and it generated around 300-500 visitors/day. I know its not much but maybe someone here could find this useful.