RS SEO Solution is unit of Promote WWW. We are providing complete digital marketing (SEO, SMO, PPC etc), website / software designing and development since 2004.
Slow manual directory submission is one of the best ways of natural link building. 10 to 50 submission per day in seo friendly reputed web directories to get high quality backlinks.
Bulk directory submission service is just name of fast or slow directory submission for multiple websites. If you are submitting 2 or more websites details to web directories, then people say this as bulk manual directory submission.