Internet security is tricky to master. An expert hacker can crack a password faster than it takes a web page to load. It's undoubtably important - now more than ever - to protect yourself online.To sum up fast facts on the dangerous state of digital security, Instant Checkmate created an infographic that shows how vulnerable most online users really are. Some highlights: A third of people use the same password for every site; and the weakest passwords (somewhat obviously) include "password" and "123456."Check out the graphic below.Are there any tips you think should be included?