After some successful start-ups in social media like Facebook, Twitter; it has been trending to start the business in Social networking sites to get the growth. Some of them build their own website while some purchase Social Networking Scripts, some of them even consult software developers to clone and customize scripts and websites.
It is not absolute that you are going to start the same business someone just got higher in growth will be your growth too. A business should be based on some rules like the requirement, uniqueness and your hard work.
Getting a Social Networking Script will help your product to provide image/place in your social media business but, with your uniqueness, your product will be better in growth and will stand among the competitors.