Flickr is a popular photo-sharing and hosting service with advanced and powerful features. It supports an active and engaged community where people share and explore each other's photos. You can share and host hundreds of your own pictures on Flickr without paying a dime. There's also a pro service that gets you unlimited storage and sharing for about $2 a month, making it one of the cheapest hosting sites around

Flickr was created by a small Canadian development team in 2002 before being acquired by Yahoo a year later. Many other photo sites (including Yahoo Photos) are easier to use, but none offer Flickr's interesting features or its cohesive community of enthusiasts.

Newbie's Guide to Flickr