Not clear on your question here.. but substance abuse is when you abuse a substance and usually an illegal one such as drugs or alcohol, and when you increase that, you're just using it more? I want to help you but the question is unclear to me!
Answer:
The correct answer is manifest, latent.
Explanation:
Manifest functions refer to the consequences that people tend to observe or even expect. For example, in the given scenario it is mentioned that following famous activists, academics, and politicians on Twitter can influence the public opinion. Here the followers just observe the actions and ideas of the personalities they follow and nothing more. Therefore, it will be an example of manifest function.
Latent function refers to the situations which are rather unintentional. For example, the question mentions that some classmates become more close while reading and exchanging tweets. There is no intention of friendship involved so it will be an example of latent example.
