If you're having trouble getting started with Social Networking, it could be the technology getting in the way. Don't think of it as a "computer thing." It's a networking tool that happens to be online. Networking is a funny word - we use it to describe the physical world of computers connecting as well as the "soft" world of relationships.
Don't have a 14 year old in the house who can show you how it works? Take this as a great opportunity to strengthen a relationship by asking for help with getting started. Asking for help, advice and suggestions are an excellent way to grow a friendship. People are flattered to be asked. And if they get you started with something, they feel some ownership in keeping you involved.