Late last week, the Department of Homeland Security issued an alert about a flaw in Oracle’s Java software that could have potentially put 850 million computers at risk. Apple, Mozilla and other companies advised uninstalling or disabling Java until an update was available and Oracle put the pedal to the metal and rushed out a fix over the weekend. Security experts, however, were still dubious about patch, lingering security issues or even the need to still run Java in the first place.

Java security flaws are also suspected in a wave of cyber-espionage attacks on computer networks used by several international governmental, scientific and diplomatic agencies The attack campaign, dubbed “Red October” by security firm Kaspersky Labs, seems to have been active since 2007 and continues — albeit without the brawny Sean Connery-Alec Baldwin star power of the 1990 film that was made from the namesake 1984 Tom Clancy thriller, “The Hunt for Red October.” (The film version is available to stream on Netflix, and if you have a Nintentdo Wii, you can also watch it there since Amazon’s Instant Video service is now available on your game console.)

In case you have too many online friends and can’t keep track of their interests, Facebook just introduced a new feature this week called Graph Search. This future tool lets you match up people on your friends list with things you are looking for, like buddies with similar hobbies — as long as they’ve shared the info publicly. Graph Search is in the beta stage and may cut into LinkedIn’s territory more than Google’s as some have speculated. Also in the social-network news: MySpace made its redesigned site available to the public this week.

John Scully, a former Apple CEO, said the company needs to adapt to a changing world by overhauling its supply chain to meet demand for cheaper smartphones in emerging markets. Competition from Samsung, which has now sold more than 100 million Galaxy smartphones, is probably adding to Apple’s angina. (Some research has even shown that younger buyers consider Samsung’s phones way cooler compared to the iPhone, which may feel like the 1990’s in reverse for the longtime Applefolk.)

But while Samsung and Apple duke it out in the profitability-and-popularity contest, Microsoft is still trying to get developers to write apps for its Windows Phone handsets. Perhaps in a whiff of reality-show excitement, the company launched a contest this week called “Window Phone Next App Star” that invites developers to create and submit their apps for judging and rating by public voters. Research in Motion is also in app-gathering mode and just got 15,000 new apps for the BlackBerry in about 37 hours thanks to a couple of Portathon sessions that invited developers to port versions of their apps for other systems to the BlackBerry OS for fun and prizes.

Meanwhile, up on Mars, NASA’s Curiosity Rover is rocking out and may be doing some drilling up on Mars. Yay, science!

Finally, we here at Pop Tech Jam note the passing of Internet prodigy and programmer Aaron Swartz, who sadly committed suicide at the age of 26 last week. Swartz, who helped create RSS at the age of 14, worked on other Web applications and was an advocate for freedom of information and open access online, was facing a Federal trial this spring for downloading millions of scientific journals, scholarly research and other documents from MIT and the JSTOR archive. While MIT has launched an internal probe of the events leading up to Mr. Swartz’s death, activists like the Electronic Freedom Foundation have called for an overall in computer crime law. Requiescat in pace, Mr. Swartz, and thank you for making the Internet a better place.