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Self-selection bias occurs when individuals choose whether or not to participate in a study. This can lead to a sample that is not representative of the overall population. In the case of the gamefaqs.com survey, the respondents were the ones who decided to participate, rather than being randomly selected. This means that their perspectives may not fully reflect those of all gamefaqs.com visitors or the general U.S. population.
This type of bias poses challenges for researchers because it can introduce a skew in the data results. If, for example, people with more active online social lives are more inclined to participate, then the survey results might not accurately represent people with more varied social activity levels.
To mitigate self-selection bias, researchers often need to employ strategies such as random sampling or incentivizing participation to ensure a more comprehensive representation of the target group.

A representative sample is a subset of a population that accurately reflects the members of the entire population. Achieving a representative sample ensures that the survey results can be generalized to a larger group.
In the exercise, the survey from gamefaqs.com does not serve as a representative sample of U.S. adults because it exclusively features responses from individuals who visit that specific website. These respondents likely share specific characteristics or interests, such as being more engaged with gaming and online communities, which might not be common in the general adult population.
For a sample to be representative, it should be randomly selected, covering various demographics, interests, and lifestyles that adequately represent the target population. When a survey does not achieve a representative sample, its findings are limited to the surveyed group and cannot be reliably extended beyond that group.

Voluntary response bias happens when participants in a survey or study have elected to partake of their own accord, often leading to a non-random, unbalanced sample that can skew the findings.
In the gamefaqs.com survey, the results were based on voluntary responses, meaning people responded if they felt inclined or had a particular interest in the topic. This can skew the results toward those who have stronger opinions or experiences about their social lives online or offline, while those who are indifferent or uninterested may choose not to participate.
Consequently, voluntary response bias can distort survey outcomes, making it challenging to determine whether the findings accurately reflect the opinions or behaviors of the entire population in question. To reduce this bias, researchers may implement mandatory participation or provide incentives for participation to ensure a broader and more balanced range of responses.