Flickr
Flickr focuses on photo albums and work from a community.
What it does
Flickr lets photographers upload, organize, and share albums.
When to use it
When researching a local event, use albums to locate the photographer and context.
Visit Flickr official site
Burst
Burst focuses on stock photos geared toward business.
Death to Stock
Death to Stock focuses on story-led photography collections.
Glass
Glass focuses on a sharing community centered on photography.