Share Your Trip, Connect With Travellers – TripSay.com
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TripSay is a virtual place for travelers to share their travel plans, connect with their traveling friends, and share tips. Imagine your self planning a trip to Istanbul, only to find that your friend is already having a similra plan. You could, if not for the whole journey, plan a shared activity on a specific day, meet a friend outside, and share more useful tips together as well.

The site is built from users interest, favorite places, past travel information and such. While I’ve had personal problems with the site using Chrome browser (if that’s related), the site does seem a bit fun and with a little work can become much more useful.
ReadWriteWeb has more insight about the site.