Previously available in a beta, AllCast is now in the Google Play store. The app wirelessly shares photos and videos from an Android smartphone or tablet to a number of devices including Apple TV, Xbox 360 and Xbox One, Google TV, Roku, certain Smart TVs and other DLNA-compatible devices. Google’s Chromecast isn’t currently supported because the Chromecast SDK still in flux. The software requires Android 4.0 or better and while there is a free version, a $4.99 premium edition removes ads, splash screens and limits on video lengths.

In what Fortune described as an “uncommon move,” Square CEO Jack Dorsey has voluntarily given back 10 percent of his shares in Square back to the mobile payments company. Dorsey currently owns 30 percent of the company, so the shares add up to 3 percent of equity or as much as $150 million. The move greatly increases the pool of shares available in Square, and Fortune attributed the move to Dorsey’s interest in rewarding his company’s 700 employees. Dorsey’s stake remains at roughly $877 million.

The Spanish handset maker Geeksphone has released some specifications for its Revolution phone, which will allow users to change operating systems without voiding the warranty — it will come with Android as standard, but users will also be able to install Mozilla’s Firefox OS (or Boot2Gecko, as it’s known in the case of non-Mozilla partners such as Geeksphone). Now we know the Revolution will be based on a 1.6GHz Intel Z2560 processor and will sport a 4.7-inch IPS qHD screen. It will have a 2,000mAh battery and an 8-megapixel camera with flash. It will also have expandable storage, although Geeksphone hasn’t specified the built-in storage yet.

Strong encryption may still work, despite the best efforts of the NSA, but a new research paper suggests that clever audio analysis can recover users’ private encryption keys. The exploit takes advantage of the fact that processors make noises that can sometimes betray what they’re doing — noises that even a mobile device’s microphone can pick up. Actually doing this would require a very, very specific set of circumstances, but the heavily paranoid might want to make sure they’re using the latest GnuPG RSA encryption software, namely version 2.x.

Instagram released a blog post on Thursday detailing the results from its foray into advertising content, which rolled out on November 1, and it seems like the company is happy with the data. The company pulled research from the first four programs, with standout data coming from Levi’s and Ben & Jerry’s: the former reached 7.4 million people over nine days, and the latter reached 9.8 million people over eight days. The key metric for Instagram seems to be “Awareness,” as it boasts glowing ad recall increases for both brands. It’s early days, but the ads seem to be doing what Instagram wants them to do.

Maybe it’s not doing so bad after all: All Things D‘s Kara Swisher reports that Fousquare has closed a $35 million Series D round, led by DFJ Growth and the Capital Group’s SMALLCAP World Fund. Swisher says that the round does not significantly raise the previously estimated $600 million value of the company, but it’s definitely better than the $41 million in convertible debt it took earlier this year. Crowley told Swisher that the money “validates” Foursquare’s transformation into a “smart” passive location app, but it’s still early days — Foursquare still needs to perform before that will be true.

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