Hello guys, I'm very new here on the forum and in the world of seo. i registered here because I have a question about seo. My perception about search engine optimization is that It is very difficult and one must study this topic for at least 6months to achieve any rank. When I read about seo the topic is always google, bing and yahoo. But what about for example Delicious? there is a search option in delicious and for example my blog does not appear there. Is it still SEO to appear in not search engines but in Delicious's search? Are there any best practices for that kind of marketing?