People have different reading habits online than they do offline.Online, people tend to scan. They scroll through an article quickly and form an impression. Looking for words, highlighted concepts, photos and commitment level, readers decide whether they need to commit time or if anything "grabs" them.
For this reason, bloggers and website authors need to design their content. Additionally, well-designed content can be good for SEO and social media marketing. Well-designed content can attract more links, social shares and bookmarks.