The page you see when you open Flickr in your Web browser is an activity feed from your contacts.

Explore is where you find the most-favorited and most-commented photos on the service.

New for Flickr is the Camera Roll, and its Magic View option, which can automagically categorize your images by their content and apply keyword tags.

The new Uploadr utility automatically sends photos from specified folders to the online storage privately. It's an excellent way to back up your precious digital memories.

You can also use the browser-based Uploadr, which even lets you tag, rotate, and organize images.

Each Flickr user has a Photo Stream; note that now you can switch between public and private viewing. The latter includes photos only visible to you.

Flickr Groups offer like-minded photographers and their fans places to share and enjoy each other's work. There are Groups for every interest, some of which include more than a million images.

Here's a look inside a group for young photographers.

Flickr can place photos on a map.

The included Aviary online photo editor not only offers standard lighting and color fixes, but also Instagram-like effect filters.

You can group photos that belong together into Albums.

Each user gets a profile page, only viewable by contacts, showing user photos, favorites, and contacts.

You can see how many times your photos were viewed over the past two months or for all time.

One cool Flickr feature is the Camera Finder, which shows photos taken by pretty much any camera model you can think of.