Best way to create a Mobile version of a Social Network?
 

I have recently created a Social Network using HTML, CSS, PHP, JavaScript, Ajax, MySQL, PhpMyAdmin and with an Apache Web Server. What would be the best way to make this Social Network compatible on various Mobile Devices? And also with my Chat system that uses Ajax, will mobile devices run Ajax correctly? Any help would be greatly appreciated. And please input that a 14 year old would understand. Yes, I am 14 and taught myself various types of coding when i was 11 and 12, Thanks CF Users!