I have a guess that the numbers for "I have a computer/Internet at home and frequently use it." are actually slightly higher than reality because I think a few students may have been hesitant to mark anything else. Especially considering this, 13 is not very high (it is less than half the class). This is particularly relevant with the increasing number of Internet-related school activities. For example, today were ASB elections, which were conducted over the Internet. Students voted on campus, so Internet access at home did not directly affect their ability to vote. However, those who are used to being online would, of course, be more comfortable with this format.
I think this makes using technology in the classroom all the MORE important because it is my students' opportunity to learn about a tool that is becoming increasingly important for success in our society! However, I think this also means that I will not be using tools that require (or at least favor those with) access outside of the classroom, such as Twitter, Facebook, or Instagram. Technology will play an important role, but I will be careful to keep this importance within the realm of the school day.