Think of it this way: The more specific your content, the more specific the needs of your audience are -- and the more likely you'll convert this traffic into leads. This is how Google finds value in the websites it crawls; the pages that dig into the interworkings of a general topic are seen as the best answer to a person's query, and will rank higher.
Use social networks to expand your reach. Social networking is hugely important, and ensuring that you have a solid presence will have a large impact on your views. Post compelling content and you’ll soon build a loyal following. Follow and share with other users, who may reciprocate and follow you. There are a variety of ways that you can use social networks to extend your online presence, depending on the needs of your site.[3]

When would this be useful? If your site has a blog with public commenting turned on, links within those comments could pass your reputation to pages that you may not be comfortable vouching for. Blog comment areas on pages are highly susceptible to comment spam. Nofollowing these user-added links ensures that you're not giving your page's hard-earned reputation to a spammy site.
Hi Brian, i absolutely love your content.My competitors and influence rs are very strong-most of them government bodies or supported by government, or travel guides known worldwide.I constantly follow them,get onto,share,comment etc.they share photos that are submitted to them,and i do photography myself which takes hours and still can’t reach out big audience…Any idea please what could i create that my influence rs would love to share (hard to find out what they care,they get 100’s photos submitted daily and collaborate with other big names…) Please help me.
Robots.txt is not an appropriate or effective way of blocking sensitive or confidential material. It only instructs well-behaved crawlers that the pages are not for them, but it does not prevent your server from delivering those pages to a browser that requests them. One reason is that search engines could still reference the URLs you block (showing just the URL, no title or snippet) if there happen to be links to those URLs somewhere on the Internet (like referrer logs). Also, non-compliant or rogue search engines that don't acknowledge the Robots Exclusion Standard could disobey the instructions of your robots.txt. Finally, a curious user could examine the directories or subdirectories in your robots.txt file and guess the URL of the content that you don't want seen.
Do not be fooled by those traffic sellers promising thousands of hits an hour. What they really do is load up your URL in a program, along with a list of proxies. Then they run the program for a few hours. It looks like someone is on your site because your logs show visitors from thousands of different IPs. What happens in reality is your website is just pinged by the proxy, no one really sees your site. It is a waste of money.