Ask YC: Data building

We have recently completed one of the milestones for our web start up, and we are at the stage where we can start entering and building data.

Our idea is similar to TripAdvisor or Yelp, and we think we need to have a lot of data before officially launching our site, in order to attract new users.

We were wondering what people usually do in this situation, because manually entering possibly thousands of items (and even fake users) is very time-consuming for two co-founders.

Thank you very much, and have a great day, all of you.