Where can I buy the most cheapest mobile traffic?

I am getting pretty decent traffic in a niche which is very competitive atleast 2000 uv per day. But still I am seeing that the traffic is not turning into sales. What should I do?

Which is the fastest way to get the most targeted traffic for an eCommerce site? So that not only it will have engagement and outreach but also conversions as well.

I am bit confused right now. I was hoping to build my own web 2.0 blog network in order to support and rank my main site. Which type of article should I post in them? Should I post the review of the articles posted in the main site.

What are the factors that really effects the Yahoo SERP's? And I am not talking about quality backlinks.

I am advertising medical equipment and medicines for old age people. We have a pretty decent budget for PPC. Which ad network should we choose? I a bit confused right now.

Which is the best social network for Affiliate Marketing according to you guys??

Till the week before the last week I was receiving atleast 5 leads from 1000-2000 email recipients. But from the last week I have increased the number to 5000 recipients but still the number of leads is falling and now their average number is 3. What should I do?

What are the possible ways that I can use to promote my newly build mobile apps? Considering the methods of spending money also.

I am seeing terrible fall in international traffic. The South American traffic are low unlike the last month. The zombie traffic of April is not gone but still they are also present in a large amount.