Maybe consider looking at the neurological response to social media and addictions in general. Not my area of expertise at all, but I am reasonably sure there is plenty of info showing that social media(or gaming, porn etc) can elicit a dopamine response, as do many addictive drugs.
Perhaps also think about behavior? Addicts generally exhibit at least some common traits - is there something to think about here? Is there a similarity between someone craving social media validation and an alcoholic craving a drink? What would an addict do to get what they need? Lie? Cheat? Abuse others? Some people make a living out of lying on social media - they claim things that aren't true and lie their fan-base etc, others abuse an bully using social media. There are loads of comparisons out there.
I think the jury is out there stating that social media is addictive the same way that pretty much anything can be addictive. It depends on the individual I guess. Your job is to make the argument either for or against.
For the survey, maybe ask how many hours per week do you use social media? How many types of social media? If no one found out, would you lie for more likes/thumbs-up/subscribers etc?
Not to state the obvious, but if you are writing an essay, try to find at least a couple academic reports(there are loads - I just looked) to cite in your own report.
I am not a massive fan of social media and I would have been annoyed if I would have to write a report during my science access course, but it actually seems like an interesting topic and certainly there is plenty to write about.
Good luck!