I learned from this forum that posting my websites, web pages, blog articles to social bookmarking sites and they really helped me in SEO. I got indexed on new pages or article blogs in just a weeks or even days.
I don't post to popular social bookmarking sites like Digg because they banned me off since my niche is about free dating services so Digg does not like relationship or dating tips.
I just posted to other social bookmarking sites at least once a week.
I don't know other methods.
I stopped submitting to web directories.
I conclude that social bookmarking sites are best SEO method.
Thanks for reading.