Welcome to Second Life to most of us that have been here for some time don't really think much about it, but there are some people that have never heard about Second Life
So if thats you and want to learn about it here are some links to get you started.
http://secondlife.com/whatis/?lang=en-US
http://secondlife.com/community/?lang=en-US
Connect with Friends and Meet New People
In Second Life, there's always someone to talk to, dance with, learn from or perhaps even love. You can meet people all over the world without ever leaving your home. And here, there's no jet lag and the clubs and stores are always open.
Groups in Second Life
Join up and expand your horizons
Share your thoughts and connect with others by joining any of the thousands of unique groups within Second Life. Group topics are as a diverse as Second Life itself.
Events in Second Life
Something is always going on
Parties, workshops, contests and more -- the Second Life world is buzzing. Anyone can plan and throw an event, so don't be shy about letting your social butterfly flutter. Whether you're looking for something social, educational, competitive or just plain old weird, check out the Events