In epidemiology and public health research, caution is necessary when addressing results reported by studies based on the administration of online questionnaires. The most critical limitation in such studies is their impossibility of guaranteeing the representativeness of the sample. However, when having a representative sample is secondary, online questionnaires are an excellent alternative for exploratory studies that seek to obtain information about emerging phenomena quickly and cost-effectively or address sensitive issues, for this approach allows reaching populations difficult to get in contact with using traditional strategies. Online research allows the complete anonymity of participants and ensures they provide a more honest response, regardless of their social desirability, any stigma, or discrimination.