What a great, easy to read blog post. It was a great idea to use the term Netizens. Not many people would be aware of Netizens so this is a great inclusion to your first sentence which then grabs the attention of the readers. The pictures used in the blog are also an enticing aspect. The first one is unusual so it grabs the attention once again. I also like how you included the link to a guide with more information.
Perhaps giving examples of previous cases where people have been affected by poor decisions on the internet would be good. A good example includes this case, http://arstechnica.com/tech-policy/2008/12/court-rejects-appeal-over-student-teacher-drunk-myspace-pics/. Also, a good idea might include if you made reference to your own life and how your own digital footprint might affect your future.
Overall good work.