Dear Sir/Mam, I want to know how can i judge that particular DS or SB site is bad/nonprofit for SEO..Some DS and SB sites also called as spam sites...how can i know about them?? pl guide..
Sites with lots of advertisement are bad. And if you are submitting your site in other DS or SB site those are not related to your niche then that site is non profit site for you.
Simply focus on the popular sites, and As far as the quality of the sites is concerned always go for the Domain Authority scale, if the Domain Authority value is less than 30 , that domain would not be fit for your linkbuilding.