In every campaign and cause I have worked/volunteered for we always collect email addresses for various reasons (updates, donation solicitation, GOTV, etc...) and each time we are left with a partial list of meta data on our subscribers for various reasons. As the campaign grows so does our disconnect of solid meta data on all of our subscribers/voters. To fix the issue we always had to spend time identifying our subscribers through various "profile update" emails or through basic voter identification. Either way it was expensive and time consuming. 

Thanks to a recent update/change to Facebook this process has become much simpler. 

Under the "Find Friends" section of Facebook you can now upload a CSV file (basic version of an excel document). Upon uploading the file you are then able to see the profile information that matches the email address(es) you specified. Furthermore, you can also then invite your supporters to be your friends on Facebook (another great bonus for your campaign). Quick, simple, and very effective way to update and complete your meta data on your subscribers. 

For those really geeky folks, you can also use a specific URL and screen scrape the data into a script to automate the process. The URL for this purpose is http://www.facebook.com/search/?ref=ffs&q=name@domain.com&o=2048&init=ffs You can give it a try here by searching for my account. 

UPDATE: From Facebook:

Facebook’s Statement of Rights and Responsibilities says: “If you
collect information from users, you will: obtain their consent, make it
clear you (and not Facebook) are the one collecting their information,
and post a privacy policy explaining what information you collect and
how you will use it.” Additionally, the SRR states that: “You will not
collect users' content or information, or otherwise access Facebook,
using automated means (such as harvesting bots, robots, spiders, or
scrapers) without our permission. ” More details can be found here: http://www.facebook.com/terms.php.