If you had to choose paid forum scripts then which one will you choose Xenforo or vBulletin?

Which keyword should I choose and build content according to it? A keyword which has lots of posts that people already posted about it but having some content gaps or a keyword which has no competition. Which will be better?

Does more traffic means that I will rank even more better? Does the amount of traffic impacts SEO.

I am about to start an ad campaign for my site of gaming niche. Is there any average ROI that I can expect from it? I am going for Adwords for my ad campaign.

What are possible ways to promote a new forum? Which has few members to contribute and much less content then its fellow other forums.

Is there any ratio that we should to keep up between no-follow and do-follow links? Any kind of suggestions will be much appreciated.

If I pay any fellow blogger for a blog post which will be like a review or testimonial about my site and products. Then will it be helpful to get me ranked higher?

Why the eCommerce sites needs a blog always? What are the probable reasons to add a blog?

How can I increase my Google Plus followers effectively? I have currently about 60 followers. And its increasing in a very slow rate.

Which is the best network according to you guys to start with as an affiliate as a newbie?