Sentence:  The Internet has created many opportunities for online voting. Unscrupulous people will create <WSD>sock puppets</WSD> in order to stuff online ballot boxes. In other cases, a sock puppeteer may create multiple identities to support arguments, voice opinions, or otherwise create the online illusion that may people support the sock puppeteer. This practice is called a "Sybil attack"... 
Meaning of the word marked with <WSD> tags:  An alternative pseudonymous online account, especially one used for abuse.