[jor]

It frustrates me to find yet another site that is unusable without signing up through Facebook. Not everyone uses Facebook (cough, cough-- me), and some who do don't want to grant access to personal information.

Also, what makes this site any different from simply utilizing one's social graph directly on Facebook, Twitter, Google+ etc? Why would one need your service when he/she could just tell their Facebook friends, "Hey everyone, I'm traveling to Rome this week. Does anyone have friends there I should meet?"

I think if you have a solid answer for this, it may need to be communicated more clearly on your landing page.

On the upside, good job with the site design. That part is pretty solid for a first go.