flickr, photo sharing, social networks, social networking, yahoo, marissa mayerYahoo launched an update to its Flickr app for iOS today, which allows users to take photos from their mobile devices for the first time and adds 16 filters, built-in editing and an Explore feature.

The move comes amid a war over filters and Twitter integration that kicked off when Instagram yanked its photos from users’ Twitter feeds.

“We’ve worked with our partners to ensure that your photos look gorgeous no matter where they are viewed, on or off Flickr,” Yahoo bragged in its announcement in an apparent swipe at Instagram.

Flickr also supports sharing through Facebook and Tumblr.

Flickr has added an Explore feature to both its iOS app and its Web service. The feature highlights “the most interesting photos added in the last 24 hours,” according to Yahoo. Users can also select previous time periods and filter by location.

“You can see the photos that have been captured around you, whether you are in the heart of Paris or in your home town,” said Markus Spiering, Flickr’s head of product, in a blog post.

The company seems to be responding to user sentiment that Flickr was one of its strongest assets: A website popped up immediately after Marissa Mayer’s appointment as CEO that said, “Please make Flickr awesome again.”

But Yahoo may have farther to go before it can regain its technical credibility. Several early reviews of the new app indicate that the log-in feature doesn’t work.

“Seriously Flickr. Your dev[eloper]s didn’t test this update. The log in is BROKEN. Fix this ASAP please, so I can see what else is broken,” wrote user lamdarkstaff.