Hi,

I didn't know where to place this question.... it's a doubt I have more than a question.

If you plan to design or develop a website, or a social network, or any kind of web application that must deal with several concurrent users (let's say millons of concurrent users, like Facebook) , must be up all of the time , must deal with lot of email exchange and manage sms traffic maybe.

How and where do you start from?
There are a lot of issues coming to my mind... from choosing the programming languages (php, javascript, html, java, etc ) , choosing the best DBMS to handle that kind of traffic, designing server clusters, hosting the application, etc etc...

What would be the best approach and what advises should be on mind to face this kind of project?

Thanks