I\'m making a small social networking web site for a specific university\'s stud

Question

I'm making a small social networking web site for a specific university's students (where I study) and I'm concerned about security (access to the database). What should I do? What I have to check for last time until I went online?

(Yeah, Facebook Facebook. Facebook don't have that community sense. You cannot find all your department mates on Facebook. You cannot see all foreign students on Facebook. You cannot hide your identity on Facebook while commenting, etc etc. Just please don't compare it with Facebook, we had a great local social network until it went public .

Explanation / Answer

Sanitize user input.

Don't trust any data given by the user. I cannot stress this enough.

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