Facebook is clearly the top tool for social networking, but new and arguably more innovative social networking alternatives have emerged in recent years to fill the void left by Friendster and My Space.
"Facebook has put together a social graph putting together a unique and powerful set of data for advertisers.
Nextdoor's mission is to rekindle this community spirit in neighborhoods across the U.
S., by connecting users and their neighbors through a localized social network.
Users join with their home address and are automatically placed into a home neighborhood.
This ensures that all of the content, connections and messages you see will come from other users living in your area.
Foursquare Foursquare is a location-based social network that lets you "check in" at venues using your phone or mobile device.