Yes, personal responsibility is also needed.

Keep in mind though that Facebook has used a lot of behavioral manipulation to squeeze engagement out of its users as much as possible. They purposeful made their product addicting.

In a lot of third world countries, digital literacy is lower than in developed countries so awareness of the bad effects of social media is low. Heck, even the US, didn't realize how bad addiction to social media is until the past few years.

Maybe a good approach can be:

- When there are millions of people with otherwise functional lives falling for unhealthy behaviour then you blame the carriers.

- When there is a very small percentage of the population engaging in that behaviour, then is personal responsibility.

For example, personal responsibility cannot be asked for when people lack education.