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http://jordanorelli.com/post/32665860244/how-to-use-interfaces-in-go

Wrapping up

I hope, after reading this, that you feel more comfortable using interfaces in Go. Remember the following:

• create abstractions by considering the functionality that is common between datatypes, instead of the fields that are common between datatypes
• an interface{} value is not of any type; it is of interface{} type
• interfaces are two words wide; schematically they look like (type, value)
• it is better to accept an interface{} value than it is to return an interface{} value
• a pointer type may call the methods of its associated value type, but not vice versa
• everything is pass by value, even the receiver of a method
• an interface value isn’t strictly a pointer or not a pointer, it’s just an interface
• if you need to completely overwrite a value inside of a method, use the * operator to manually dereference a pointer