HEATKEYS

TripAdvisor - Unbiased hotel reviews, photos and travel advice for hotels and vacations - Compare prices with just one click.

foursquare

Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, post links and videos, and learn more about the people ...

YouTube is a place to discover, watch, upload and share videos.

San Francisco - User Reviews and Recommendations of Top Restaurants, Shopping, Nightlife, Entertainment, Services and More at Yelp

Photo-sharing community. Discover the world through photos.

Garmin Connect is a community-based website for runners, cyclists and outdoor enthusiasts who track their activities with Garmin devices. Garmin Connect makes it easy to upload, store, analyze, map and share activities online.

Twitter is without a doubt the best way to share and discover what is happening right now.

Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you...

Diigo is a powerful research tool and a knowledge-sharing community