4square, Facebook & Google+

Welcome to this morning’s edition of “First To Know,” a series in which we keep you in the know on what’s happening in the digital world. We’re keeping our eyes on three particular stories of interest today.

Foursquare Updates iPhone App With New Notification System

Foursquare just released version 3.3 for iPhone. The update comes with a revamped venue details screen and the notification tray, which Foursquare rolled out July 5 only for the Android app and website.

The notification system is a feed of what your friends are doing, including comments, to-dos and mayorship changes.

Rihanna Is Now the Most Popular Woman on Facebook

Rihanna has surpassed Lady Gaga as the female with the most Facebook fans. Randi Zuckerberg, Facebook’s marketing director, announced the news early Friday morning via a tweet: “Sorry, Gaga! As of today, Rihanna has passed Lady Gaga as the #1 most popular woman on Facebook #ClearlyLifeChangingNews.”

Google+ Users Are Nearly All Male

Google+, which launched June 28 as an invite-only social network, has so far attracted a user base primarily made of males. One stats tracker reports that 86.6% of Google+ users are male, while another says 73.7% are male.

Further News

• The U.S. Department of Defense lost 24,000 files in a cyber attack in March, a Pentagon official just revealed. It may be the most damaging breach the U.S. military has seen.
• LG has launched two new Gingerbread phones:the LG Optimus Pro (LG-C660) and the LG Optimus Net (LG-P690).
• Celebrity parents Kate Hudson and Matt Bellamy have named their newborn “Bing.” Although Microsoft’s Bing search engine didn’t inspire the name, it’s hard not to make the comparison, especially since parents around the world have already named their children Like, Facebook and Google.