These are intended to facilitate and assess understanding of the reading materials. Reading reflections should be within one page (roughly within 600 words if you are using 12pt font). You won’t be penalized if you write more, but being succinct is another great writing skill which you should aim to cultivate in this course.
You do not need to summarize the full paper, but you need to reflect on what additional questions the work enables. Does this help you think about your next big project? What will that be? Does it help you think about new ideas, new ways of thinking about your daily online life? What other questions the paper makes you think? What else the paper is not answering or is concerning or is just intriguing?
Most importantly, a reader while glancing at your reflection should be able to easily spot these questions. So use bold, italics, bullet points or other means of highlighting them. NOTE the stress on REFLECTION. If you simply summarize the paper without any reflection, you will be automatically scored zero.
This is an individual assignment and work submitted should be written solely by you. Here is a great example of a reflection written by my colleague, Prof. Kurt Luther. Here are few other examples from students in my class in prior semesters (example 1, example 2, example 3, example 4, example 5).