So Facebook has hit the 500 million user mark - Does that make it social media king? Sure, but it doesn't necessarily mean Facebook is the best option for all our social media needs.

Here's a list of other online tools:

Google Wave

The newest web application from Google allows a group of people to share the same conversation, and link images, maps and video.

Foursquare

Uses a mobile phone's GPS to enable a sort of scavenger hunt among friends in their neighborhood. People can let friends know when they've "checked-in" to places within the neighborhood and their experience.

Formspring

A site where users can ask and answer questions. Want to know what other people think about your new sneakers? Take a photo and ask. Need help deciding who to take to the prom? Let the online world decide.

LinkedIn

Allows users to create a profile of their professional experience to help build business connections. LinkedIn has more than 70 million members in more than 200 countries.

Yelp

A site where people write reviews of places from restaurants to spas and add entries to their to-do list.

- Jose Moreno and

Aisha Breland-Henry

President and CEO of Nassau University Medical Center Thomas Stokes explains the problems caused by the aging infrastructure within the hospital. Newsday Associate Editor Joye Brown reports.  Credit: Newsday/Kendall Rodriguez

Inside look at NUMC's aging infrastructure President and CEO of Nassau University Medical Center Thomas Stokes explains the problems caused by the aging infrastructure within the hospital. Newsday Associate Editor Joye Brown reports.

President and CEO of Nassau University Medical Center Thomas Stokes explains the problems caused by the aging infrastructure within the hospital. Newsday Associate Editor Joye Brown reports.  Credit: Newsday/Kendall Rodriguez

Inside look at NUMC's aging infrastructure President and CEO of Nassau University Medical Center Thomas Stokes explains the problems caused by the aging infrastructure within the hospital. Newsday Associate Editor Joye Brown reports.

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