I have found very interesting article that was very helpful for me. www(dot)smashingmagazine(dot)com/2009/07/28/designing-read-more-and-continue-reading-links/
"Why "Read more" links are so important. They are important for several reasons, most importantly because they allow designers to compress content on the home page. By compressing content, you fit more content in less space. This means that readers can scan headlines more quickly and that you can fit more information above the fold.
Also, "Read more" links allow website administrators to more easily track the most popular content. Designers who put entire articles on the home page may make it difficult for website administrators to track the most popular articles and understand what users want to see.
The third and probably most practical reason for having "Read more" links on a website is money. Websites that monetize traffic understand that the more their readers click on links, the more likely they will look at and click on advertisements. "Read more" links can double or even triple the number of page views a website receives, making it more attractive to advertisers."
I hope that will help you.