5 out of the top 15 I have not used. This is not due to inability, it is merely because I have chosen other sites for my social networking and communication. I am definatelymore keen on using powerpoint over prezi and this may be due to my comfort level in using that program. Twitter is by far the program I use the most as far as the top 15. This is a daily used application on my smart phone along with Instagram. I am slowly getting used to all the applications and fully utilizing my smart phone and the internet.