I read a lot of things around the web.I saw people selling 4K backlinks and social real users tweets, likes, sharing links on Facebook, Twitter, Instagram etc..Now, assuming you have opened a site which is on beta stage and users needs invitations to signupassuming you are not an administrator of any huge Facebook or social community (Facebook groups, meetup groups, forums, chats etc..),assuming you don't have much money to spend for a huge campaign on paying ads,assuming you want to stay out from venture capitalists, angels and so on (at least to check if you can do it without external/third parties help)so...Is trusted SPAM, or paying backlinks, the only way you can go for getting some traffic to your website?If not can you describe how can you promote your website on the web excluding all the points above?
Website traffic - with no money (backlinks, spam, likes, tweets)
backlinks;traffic;advertising;website promotion
The best source of free traffic is search engines.  People perform around two trillion searches on Google each year.  Of the people that click on a result, 94% click on the organic listings and only 6% click on the ads.   That means that there are more free clicks available than there are all of the paid clicks that you named combined.Search engine optimization (SEO) is a huge topic beyond the scope of this post.  The biggest requirement is that you need to build a website that people like when they click from the search engines.  Your site must serve their need better that the other sites that are in the results.The second large source of free traffic is from something that goes viral.  That is, the content is so compelling that users share it with their friends.Gangnam Style by PSY got nearly 3 billion views on YouTubeThe Farmville games on Facebook went viral and got 83 million monthly players at their peakWhat is viral marketing gives several more examples such as Hotmail and ICQ.The third way to attract eyeballs for free is through public relations (PR).   Have news organizations run stories about you, your organization, or your product instead of paying them for advertisng.   The effectiveness of PR is usually measured against the amount of money it would have taken to get similar size or length advertisements.  