Love the idea! Love it! However, you can take it another direction and grow it into a mix between meetup and double dating so that people who simply want to socialize can do so in a group where they are compatible or have similar interests. Two people can date from this, friendships can form, entrepreneurship can be excelled as like minded people meet, etc. etc. Reminds me of plentyoffish. Just get a programmer and partner up to discuss your prospects and possibilities.
Start by asking for opinions, the possibilities of the coder to make a site like that, etc. etc., then ask for their past examples or references. Eventually, you can offer a partnership, and sign a document were by you are equal partners. Once that happens, you can figure out traffic, while your partner does coding. This is cheaper cause your partner won't charge a single penny for his hard work which usually cost a lot. You will however, have to market the idea, and start with your friends and people from your local community by releasing fliers and tell them to form groups on your site to fill it a bit rather than have an empty site and expect people to join. You can start a forum, a blog, a social networking site, etc. etc. so yeah, kudos bro!
I am optimistic about your idea as this will take social dynamics to a whole new level on the net and people will save time by logging in and finding groups of people at the same time rather than going headhunting. Think about job postings as people could look for employees or employers using it. Awesome!