This scam, like the others, steals passwords to propagate itself, he said. But it doesn't appear to abuse the compromised accounts any further than that.
Nick O'Neil, editor of the blog AllFacebook.com, said these false Web sites, like their predecessors, appear to originate from Eastern Europe.
In recent weeks, he said, at least one visible phishing scam has hit the social networking site each week.
"Facebook has been in a full-fledged war with spammers and hackers, and this is only the latest round of that battle. Over the coming weeks and months, you can pretty much guarantee that we'll see more of them," he wrote, adding that these scams are not as vicious as the ones that notoriously plagued MySpace years ago.
Smith also said that as Facebook welcomes scores of new users, about 3.5 million each week, it creates a large audience of people who haven't been exposed to the kinds of phishing attacks that hit social networking sites.
"I think we've seen as new users have joined, it takes some time for users to figure out how to use new communication tools," he said, adding that many new users are over 35 and new to this kind of social environment.
"These are kind of the new kids on the block, and so it's a little easier to pick on them," he said.
Facebook's Schnitt, however, has maintained that they have not established any correlation between new users and the attacks.
He also cautioned users to only log in to sites when www.facebook.com is in the browser and to be very cautious of any messages or links they find on Facebook that ask them to log in again. Keeping unique logins and passwords for different sites is also helpful.