Search engine optimisation or SEO, has become a huge priority for marketers over the last few years. It’s easy to see why—higher search engine rankings result in more traffic, more leads, and higher sales and conversions. But how, exactly, does it work? How does adding keywords to various site elements improve your chances of ranking well in search engines?
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.

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.

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