Final answer:
A drawback of heavy campaign use of the Internet is the potential for misinformation and bias, as well as a more divisive campaign environment.
Step-by-step explanation:
A drawback of heavy campaign use of the Internet to communicate with likely voters is the potential for misinformation and bias. With the rise of social media, candidates have the ability to spread their message to a larger audience, but this also opens the door for the dissemination of false or biased information. Additionally, negative messages can be amplified on social media, leading to a more divisive campaign environment.