Congrats fellas! - i'm curious, can you say who your top referring sites are? Does Google dominate 80% of it? Do you spend lots of cycles on SEO? I understan

Congrats fellas! - i'm curious, can you say who your top referring sites are? Does Google dominate 80% of it? Do you spend lots of cycles on SEO? I understand if you aren't comfortable answering these questions in a public forum.