Google suggest is one of my favourite helpers navigating the Internet. It will catch my typos and provides me with an improvement to what I typed. This functionality is available in many languages and not in others.
Santhosh found out that the ":" is used by many people writing Malayalam. This is the kind of mistake that Google suggest can pick up. It is also the kind of mistake that a clever spell checker can automatically fix.
When people use the wrong character in preference to the correct one, it is because it is easier to type the wrong character. To what extend is this because of using a deficient input method ?