Sentence:  “Click on everything including graphics, buttons, and links, to see where they lead. Don't be afraid to get lost, and don't worry about making mistakes. 'You can't <WSD>break the Internet</WSD>,' says Warren Shaver, project manager for ASTD Online Services.” 
Meaning of the word marked with <WSD> tags:  To cause a connection to the Internet, or the Internet itself, to malfunction.