Here's what you've missed this week:

• Square Now Sells Digital Gift Cards - The mobile-payments startup now offers users the option to buy digital gift cards through its Square Wallet app.
• Twitter To Offer Photo Filters By End Of 2012 - Here’s Twitter’s answer to Instagram’s plans to cut off embedding pictures on Twitter. Twitter, it’s being said, will be rolling out its own photo filters by the end of this year.
• Instagram Finally Introduces Crop and Scaling Tools - You'll no longer need to open up another app to crop and scale your photo; both can now be done in Instagram with a grid guide overlay. It is also reported that its tilt-shift feature has also been improved to provide "vastly more realistic rendering of depth of field."
• Google Maps Return to iPhone with New Mobile App - Google Maps returned late Wednesday with the release of the Google Maps' iPhone app. The release comes three months after Apple replaced Google Maps as the device's built-in navigation system and inserted its own maps into the latest version of the operating system.
• Flickr Updates iPhone App, Adds Filters - An all-new Flickr app was released with bigger picture presentation and the addition of 15 Instagram-like filters to enhance photos within a revised Apple iOS app for the iPhone and iPod touch.