Website help (Do I have 20 characters yet?)?

We would like help selecting two sites with identical industries but directed in different focus on audiences.any ideas

Social Networks might be a good place to start.There are so many social networks in existence now it wouldn’t become tough to uncover one that targets teens or teenagers versus the one which targets adults.

A sample might be:
Websites like myspace – Teens/Young Adults
LinkedIn — Adults / Professionals.