Interesting idea. It sounds cool.
My only piece of feedback would be about the name. When I first read the title of this post, I thought your company was a mentoring service.
TripAdvisor and Where I've Been certainly sound like travel apps.
Clickable: http://mentaway.com
Curious: How'd you come up with the name? Also: How do you plan to make money?
How much traffic is needed to make this supportable by an ad-based model?
Other than that, who are your major competitors? I know I've seen a ton of people use travel apps on facebook, but I don't think any aggregate all of their social feeds.
Have you considered a demo for someone who wants to tour the service before joining?