Select a topic that is manageable - not too broad, not obscure, and about which you can find reliable, "academic" information.
Use the mindmaps in Credo Reference to help you narrow your topic.
In general, topics in science, medicine, and technology require the most current information; current events and controversial topics require current and sometimes, historical information.
Try coming up with a research question. Your answer then, becomes your thesis statement.
Examples: Is cyberbullying more psychologically damaging than face to face bullying?
Is our increased reliance upon and use of the Internet changing (or diminishing) our abilities to read, think, and comprehend? What does the brain research say?
Does e-learning/online education provide the same opportunity and value as the traditional educational setting? Or, is online education mostly about convenience? What does the research say?