Since the addition of the Instagram Direct feature, the app's home screen now sports an inbox "tray" icon at top right.

Tapping the tray opens your Direct inbox, where you'll also see photos and videos you've shared to others.

When you share a photo or video, you can now choose between Followers and Direct using the mode switching links at the top.

For obvious reasons, you can now easily sign up for an Instagram account via Facebook Connect.

Instagram is all about discovering photos that tickle your fancy. Once you find a user you like, you can follow his or her images, and then see who they follow, who follows them, in can endless chain of discovery.

The camera mode of the Instagram doesn't add anything over what you get in the iPhone built-in camera.

Here's where you apply those artistic and retro filters that put Instagram on the map. Don't neglect the selective focus drop button. Here you can see the resizable, movable, highlighted area will be in focus.

You can only scale and crop photos taken from the default iPhone camera app.

You can share not only to your Instagram feed, but to Facebook, Flickr, Twitter, Tumblr, and email.

Every user's profile can be scanned as full photos as well as thumbnails; you swich with the line and grid buttons. Note there's a map for each user now, too.

Instagram's Web interface has improved, but you still can upload images or see photo maps.

Anyone can like or comment on your shared Instagram photos.

Instragram has created 13 new filters that can only be used for videos. They're a bit tricky to use in changing light, but can add real depth to your short images.

Unlike Vine, Instagram lets you delete and reshoot sections of video. However, you can only delete the most recent segment and you cannot re-order them.

In the app, Instagram videos do not auto-play. However, they do stand out when mixed in with other photos.

The web view for videos, like photos, is much larger than on your phone. This doesn't do even the best made video any favors.