Final answer:
The correct completion of the sentence is 'they may mock you and slander you.' Online satire can be misread, leading to negative reactions like mockery or vilification, because it lacks the nuanced cues present in face-to-face interactions.
Step-by-step explanation:
Using satire or sarcasm on internet forums may cause people to misunderstand you and think you are serious; also, they may mock you and slander you. Satire is a literary technique that employs humor, exaggeration, or ridicule to expose human follies or vices. The correct completion of the sentence is 'they may mock you and slander you.' When satire is used online without the nuanced cues of voice or facial expressions, it can be easily misinterpreted, leading to unintended reactions such as being mocked.
A well-crafted satire creates just enough distance to allow the audience to recognize the folly being depicted without overtly stating the critique. However, online communications can strip the subtlety from satire, making it harder to discern the writer's real intentions. Hence, being sarcastic or satirical on the internet should be approached with caution to avoid misrepresentation and potential vilification.