Update: When asked what the company is working on, Expono told us “we are working on improving photo browsing (bigger better photos) and new ways users can explore public/friend photos.”

Expono (@expono) is a relatively new photo sharing website that recently went live with a slew of many extensive features you won’t find on the most popular media sharing sites such as Flickr.

Expono lets you upload, manage, geo-tag, backup, embed and share your photos with social media sites such as FriendFeed, Facebook, and Twitter.

If you want to share your photos via Facebook, you just follow the simple instructions to connect your FB account with Expono, then you’ll be able to easily share full photos across Facebook. You can also tag friends in photos.

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Flickr has just updated its mobile client to show you nearby photos based on your GPS location.

The web-based app can now present you geo-tagged photos within a certain radius of your GPS location. As you move around a city, you’ll have to manually refresh the site to see updated photos in your location.

The mobile app is not as in-depth as the PC browser version in terms of features. The PC version map is more interactive as it lets you base your search on the distance from the center point, the time the photo was taken, or by “interestingness”. Also, you can’t toggle the map between Satellite, Map and Hybrid modes on the mobile version, for that, you’ll need to download Google Maps or another mobile mapping application such as the new MapQuest for iPhone.

The app could be useful if you are near landmarks or a recent past event.

Currently, the feature only works on the iPhone (requires OS 3.0) and Android powered devices.

The new feature is web-based and does not require you to install any app. You can access it from http://m.flickr.com by clicking the “Photos taken nearby” link. Unfortunately, the feature requires you to be logged into Flickr to use it.

Flickr has announced it has opened up Flickr Video uploading to all members, and not only premium paid members anymore. Videos are still capped at 90 seconds. As an added incentive for premium users, they can upload HD videos, which can be viewed by anyone. Any Flickr member can also submit his or her own content to the Flickr Clock which effectively lets anyone view chronologically what is going on around the world in different times with pictures and videos. You can also check out the Flickr Map which lets you find geo-tagged photos and videos.