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Because no follow link doesn't count in your links. So its waste of time.

Google and bing are best because both give more precise and accurate result in short time.

Internet marketing one of the best and cheap way to promote your business and give you instant result and tons of traffic.

Blog commenting is one of the best way to get traffic and get strong back link but for this purpose always comment on relevant blog and quality comment.

Should do more and more off-page seo, use forum and blog commenting also do social book marking and social media marketing that will give you better result.