"Using Instant Messaging and Chat Rooms Safely"@en . . . . "US-CERT, Using Instant Messaging and Chat Rooms Safely (Security Tip ST04-011) (Sept. 23, 2009) (full-text)."@en . . "US-CERT, Using Instant Messaging and Chat Rooms Safely (Security Tip ST04-011) (Sept. 23, 2009) (full-text)."@en . .