There is a really great guide on the National Autism Society website (UK) that helps adolescents and adults with autism develop their social interaction skills:

http://www.autism.org.uk/Living-with-autism/Communicating-and-interacting/Social-skills/Social-skills-for-adolescents-and-adults.aspx

Information like this is really crucial as adolescents and adults rarely get the same access to services as children on the spectrum.  Once they leave school there is a black hole and services disapear, especially for those who are not intellectually impaired.