Flickr is everybody’s favorite photo-sharing Web site, home to millions of professional portfolios, wedding albums and baby snapshots. Yet Flickr’s potential as a viral marketing tool–especially for higher education–has not yet been explored by most institutions.

Flickr was one of the earliest distinctly “Web 2.0” sites, and is still a standard-bearer for clean design and tightly-integrated social-networking features. There are several great reasons to use Flickr as a marketing tool for your organization, including ease of use, cost (virtually free) and unlimited bandwidth, just to name a few.

Here are five ways that you can use Flickr to reach new audiences and create a richer online experience for your existing community:

1. Upload campus beauty shots
If you search for your institution’s name on Flickr.com, you’ll undoubtedly find campus snapshots that have been uploaded by students and amateur photographers. Adding some of your own “official” campus photos into the mix is a good idea, so that prospective students surfing Flickr will see the best possible photographs of your facilities.

You’ll need an account in order to begin hosting photos on Flickr. Do yourself a favor and spring for the $20 “Pro” account, which comes with unlimited storage and bandwidth.

Additionally, don’t try to hide that you represent your institution. In fact, you should create a user name and profile that makes your status as transparent as possible– something like “University Marketing Dept.” Savvy social networkers pick up on phoniness in a heartbeat, and there is simply no reason to hide your identity; if anything, your institution could win coolness kudos for sharing photos on Flickr.

2. Start or Join a Flickr group
Flickr’s viral marketing engine comes to life in “groups,” where like-minded Flickr members comment on each other’s photos. If there’s not already a group dedicated to your institution, then create one; if one already exists, then join it.

3. Upload event pics
Organizing hundreds, even thousands of photographs on Flickr is really quite simple. You can create an unlimited number of sub folders (called “collections” and “sets”) within your account — so why not begin sharing campus event photos? Showcase cultural events and student activities on Flickr, and you’re guaranteed to reach a much wider audience than if you feature those photos exclusively on your institution’s Web site (or never use them anywhere, which is often the case).

Your organization’s Flickr album can be a powerful engagement tool with current students and alumni, as well. Group members can subscribe to RSS feeds to be notified each time a new photo is added or a new comment posted. You’ll never get alumni to log into your alumni Web site on a daily basis, but if they receive regular campus photo updates through their RSS readers, they’ll feel more connected to the university, and more aware of what’s happening at their alma mater.

4. Tag, Tag, Tag
There are dozens of photo-sharing Web sites out there, but Flickr’s tagging capabilities set it apart. Tagging (keywording) your photos makes them infinitely more findable on Flickr.com and on the Web at large. Be thorough and creative in your tagging. Choose distinct tags that are both broad and specific enough to be captured by all kinds of searches.

You can greatly streamline the uploading and tagging process by using a third-party Flickr add-on (there are dozens of them). You can then apply standard tags to entire batches of photos, and upload them all at once.

5. Invite collaboration
Your Flickr pages won’t be much fun unless people are actively commenting and contributing. So get creative and embrace the possibilities: Host a campus photography contest on Flickr, use your alumni newsletter to invite graduates to post photos, link to your Flickr group from the university’s Web site, offer a photo RSS feed from your campus events page…heck, scrap your site’s photo galleries altogether in favor of Flickr. Okay, that last one might be a little tough to sell, but you get the idea!