system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do mobile websites frequently have a "Read full article" button rather than simply showing the full article?

Often on mobile news sites, only the beginning of an article will be shown, followed by a "Read full article" button. Why is this so common?
gpt
Its typical user engagement. It tells the website that you *really* want to read the article and its not just clicks and page views. 

You are also more likely to read the full article after reading the first paragraph. You would immediately go: *hmmm... what happens next?* or *I would like to read more about this story.*