I am having a simple idea to start a directory will this work? which script will suit the best? The idea is to maintain a directory of people Those who hang at social networking site everyone will have a profile page similar to website listing... and link to their profile page in social networking site people who want to get new friends can search this site Hows this? is there anything left to add? post it here
How would you monetize it? How would you drive traffic to it? Answer those questions and you have your answer. Personally, I would just go to the social site itself and search to find the people I want to make friends with. How would your directory make that task any easier? As for which script... search the forum because there are a ton of threads regarding this.
My suggestion for anyone starting a directory is to purchase one that is already in operation. Then you not starting from scratch. From there you can build on it and grow it.
If you already have hosting space, you can use free directory script like phpld v2. It's easy to setup, easy to maintain. After installing it, just post to those popular directory lists, and do some promotion to increase pr.