Lime Juice is a social network users can actually join on the fly, via SMS. The company is sponsoring party after party at bars and clubs in San Francisco to get users to try out the product with lots of others at the same time.
The goal is to allow people in a bar or other social gathering to learn a little about the people around them, and flirt via the mobile network as a way to break the ice. The details are what makes LimeJuice interesting. It’s dead simple to join and use.
First, users can register for the service via SMS. That means if just one person in a bar is a member or even knows about the service, they can tell others and quickly get a core group to join. When you create an account, you tell it something distinctive about yourself (tall blonde, red dress!) so that people searching will be able to quickly know who you are. When you go to another event later on, you simple update the description for the evening).
Second, all of the key interaction (for now) happens via SMS. So every phone is ready to go. No need to download a java app or even go to a web page. Just send a text message to the service along with the identifier of the person you want to talk to (which you can get via search), and the message is sent to them.
Third, even though people are using the service to send text messages back and forth, phone numbers are not exchanged. LimeJuice sits in the middle, and you can block someone easily.