What does Haag mean when she says, "Facebook can satiate my social

appetite in ways that somewhat trouble me. It can feel like the equivalent of filling up on bread before dinner"? 

An introduction with a thesis statement. Three sentences that each

focus on a separate supporting idea. A concluding paragraph that summarizes your main idea and provides a call to action.
Use your sources to support your thesis. Research and prepare the passages you will consider using. Prepare the body by deciding where to place supporting information. Remember, each should act to build the momentum of the argument.
Use pathos, logos, and ethos in you persuasive strategy, as well as counterargument and rebuttal.
Finally, remember that it's okay if your ideas, opinions, or sources change during process of writing this. Writing makes us think, and it's fine - even beneficial - to have our thoughts change as we express them.