The Google+ iPhone app is impressive--it has a fairly intuitive interface, a clean design and a few cool features unique to the mobile version. And while any iPhone user can download it now, only users with Google+ invitations can currently use it.

Here's a look at five things you should know about the Google+ iPhone app, from changing your location settings to uploading photos, and a few tips to help you along the way.

When you open the Google+ iPhone app, the home screen displays five features: your stream of updates; Huddle, the feature that lets you chat among your circles; photos; your profile; and your circles. Tap "Stream" to access three views of updates.

The first view of your stream includes updates only from Google+ users in your circles. Visually, it looks a lot like Facebook's iPhone app with the user's photo next to their update, an excerpt from a link they attached and comments from other Google+ users.