The main reason of spam is that you must register your email address everywhere on the web. There are 2 simple sites that can help you to avoid spam in your inbox because
http://www.bugmenot.com/
On this site you can get many login names and password of many sites
http://www.dispostable.com/
This site site listen to ay mail adres. So if you must fill in your mail adres to register you can use [email protected] and check you mail on the dispostable site