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Profile liking is also a good technique which gives a do follow links generally. it helps to provide website information as well as it also helps to generate a live link for your website .

I think to drive traffic to website off-page optimization is important and to convert the traffic on-page should be excellent.

I think both are good depends on your link quality. Link quality is important.

you want to know link building process then you can use following method. Article submission, blog posting and commenting, forum commenting, social bookmarking etc. these are the method through these...

yes, article submission is active method of link building and which people use software may be they will get penalized.

In now days there are two most common and effective way to promote a webpage that are SEO and PPC. You can choose any one according to your need.

How could you a make a webpage which page can't crawl by SE spiders, through robots.txt then remember one thing robots.txt is not order for SE it is request.
And according to this method will not...

Both methods used for back link. I don't think so that one more beneficial compare than to the another. It depends on you that how to use both techniques?

First keep your mind on website content that are you providing relevant or rich content to the visitors. Because Content is the king. After this you can go with off-page SEO LIKE Social bookmarking,...

I don't think so because back link brings traffic and if you do not have any traffic then how will you rank in SERP.

My best strategy is bookmarking but i like to submit article and write a blog also.