After Google Talk users were targeted by scammers attempting to steal their login information, Google warned them to use caution when asked for personal information online.

“This is a phishing attempt,” the company said in a statement, “and we encourage users to be very careful when asked to share their personal information.”

Phishing is the tactic of tricking consumers into surrendering passwords, account numbers and personal information with phony Web sites, spam and various other deceptive measures. Banks are frequently targeted, as scammers try to pry into customers’ online accounts, and popular services like eBay’s PayPal are also often spoofed. Now phishing is rearing its head on the social Web, with attacks directed at Twitter and Google Chat.

Google said it had blocked the addresses being used to send messages, and that several browsers, including Firefox, Apple’s Safari and Google’s Chrome, were displaying a warning when users attempt to visit the ViddyHo Web site. Viddyho.com is also identified as a phishing site in Google’s search results.

GTalk users who inadvertently entered login information on the fraudulent site should change their Google Account password and security question, the statement said.