Is it really useful to promote an ebook in Youtube to get sales? I use facebook and twitter also but now I am thinking that Youtube can be also good.

My friend and I, have a site which sales products and generates pretty good traffic in our niche. We have a both vendors and customers list database which is really good. And some of the customers are wanting to buy traffic from the vendors. Is it okay if i track and analyze those campaigns? I have a very few knowledge in PPC but I can learn.

Where to invest money for Long term basis? Which will give a pretty good ROI.

Is this really possible to do affiliate marketing without owning a site? Are there any affiliate networks that accepts that kind of request?

I am really tired of link building. So, I want to focus on content on each site I own. Then interlink them to get ranked eventually. Are there any good hosting services where I can host my domains without leaving a footprint that I own them?

What are the best possible strategies to drive traffic to a site except from SEO & SMO?

Share your favorite Paid Traffic Sources to build an Email list/

Discuss everything about Google SERP's changes on September 2016 here.

If I knew that my clients use one definite social networking site to communicate for professional assistance & communication but all of them use different social networking sites on their own casual time but at that time they casually follow or share different interests in the field. Then what should I do? Focus on the site which provides direct professional communication or other sites which they use at leisure.

If I create a blog in my niche which only provides lists of different factors and elements than how should it go? I mean as list will be only present in the blog so I don't have to worry about content duplication.