(Part one of three)
Linking social networking to specific geographic locations ("location based networking") is an interesting concept being implemented by two popular services, Brightkite.com and Foursquare.com. While both services have similar features, their differences focus the sites on specific target markets. Some thoughts on both.

Brightkite was launched in the spring of 2008. Users register as members of the community, then they can "check in" at various locations. The site is tied to Google Maps, enabling the user to easily search for a location. For example, if I want to "check in" at a coffee shop, I can search for "CC's Coffee" via their Google Maps connection, drill down on the location, then BK will pick that up, posting the location to share with the community. Other BK users can then comment on your location.
Brightkite can be accessed from the web or from a mobile phone. The user can check in via SMS message, as well as receive notifications from BK "friends."
Brightkite also offers a photo-sharing capability. Users can upload photos via the website or mobile phone.
In addition to web-based access, Brightkite offers apps for both iPhone and Android:

The Brightkite user can participate in the BK community exclusively, or link their "check-in" posts to Twitter and/or Facebook.
- Edward Branley's blog
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