It's all about convenience and solving a particular problem for mobile users. (neilpatel.com)
When you have a problem that needs to be solved, do you seek just anyone's advice or do you seek an expert in the field to help solve your particular problem? (entrepreneur.com)
For example, one person may think that an article will make her friends laugh, while another may think that sharing it will help his friend solve a particular problem. (sciencedaily.com)