Google and Facebook separately announced the general availability of their respective data portability programs on Thursday.

Google Friend Connect and Facebook Connect are generally designed to extend social-networking capabilities broadly across the Web.

In the real world, this means making it possible for people to use their previously created Google and Facebook accounts to sign in to other Web sites that accept them. That way, people don’t have to create an account for every Web site that requires one, reducing the number of log-in details they need to remember.

MySpace’s Data Availability Initiative has a similar mission.

These programs also aim to let people port elsewhere content they have entered into Google, Facebook and MySpace, like profile information, photos, notes, list of contacts, comments, status updates and the like.

In its announcement on Thursday, Google said Friend Connect is now available to any Web site publisher and that the social features available can be added by copying and pasting snippets of code, so advanced technical knowledge isn’t necessary.

To access Friend Connect features on a Web site, people can log in using not only their account information from Google but also from Yahoo, AOL and the industry standard OpenID, Google said.

Meanwhile, Facebook urged its users to contact their favorite Web sites and encourage them to implement Facebook Connect, which is already running on places like Citysearch, CNN’s The Forum and CBS’ The Insider.

Still, the grand vision of widespread and seamless data portability is far from complete, as these and other initiatives are fairly recent, and important technology and privacy issues remain unsolved.

For example, days after the initial announcements of their data portability programs in May, Google and Facebook promptly locked horns and have been unable to work out their differences. Facebook blocked Google’s Friend Connect service from accessing Facebook members’ data, saying the Google program violates its terms of services because it redistributes Facebook user information to developers without users’ knowledge.

Hey, I have this hilarious video of you dancing. Your face is so red. You should check it out.

If you’ve received a message like that through Facebook or MySpace, you may have been exposed to the “Koobface” virus. “Koobface” comes through an e-mail sent by one of your social networking site friends inviting you to scope out a video.

Once the URL is clicked, “Koobface” prompts you to update your Flash player before the video can be displayed. Therein lies the virus, cloaked in a “flash_player.exe” file. According to the Kaspersky Lab, an antivirus organization working closely with Facebook, “the worms transform victim machines into zombie computers to form botnets.”

The McAfee Security Blog explains that when “Koobface” infects your computer, it prompts a downloaded service named Security Accounts Manager (SamSs) to load on start-up. SamSs then proxies all HTTP traffic, stealing results from popular search engines and hijacking them to lesser-known search sites.

A clear eye for fraud will help you avoid this mess. You can usually spot phony e-mails by their titles. Kaspersky found the following: Paris Hilton Tosses Dwarf On The Street; Examiners Caught Downloading Grades From The Internet; You must see it!!! LOL. My friend catched you on hidden cam; Is it really celebrity? Funny Moments. My own “Koobface” attack came in an e-mail entitled, lool, yoour blushingg afce is so funny! Checkk out. Obviously, Paris Hilton never threw dwarves, and in all likelihood, my 26-year-old friend knows how to spell more than two words. These are clear indicators you’re being attacked.

Facebook has posted instructions about how to remove the “Koobface” virus: give your computer an antivirus scrub-down and change your Facebook password.

This attack on the world’s most popular social networking site and its 120 million users comes just weeks after Facebook won an $873 million lawsuit against several people accused of hacking user accounts and spreading spam.