Teen Brain Online II: Understanding How Social Media Affects the Teen Brain

Inclusion Criteria: * Between ages 13-17 * Depression screening scores on the MFQ-C in the mild (MFQ = 12-25; N = 20) or moderate-to-severe range (MFQ ≥25; N=30) * Possess their own smartphone to complete web-based ecological momentary assessments (EMA) using WebDataExpress. * use social media apps (e.g. Instagram, twitter, reddit, discord, YouTube, etc.) at least 3 times a week, on average, per teen report Exclusion Criteria: * Presence of a serious neurological or medical condition, by parent report * Unable to read or speak English or cognitive impairment preventing ability to complete assessments. * Hearing impairment preventing ability to hear and understand instructions conveyed via headphones in the MRI scanner * Possible pregnancy, as determined by participant report * Presence of probable substance use disorder, as determined by participant report * Presence of MRI contraindications (e.g., dental braces, history of metallic foreign objects in body such as aneurysm clips or other devices or questionable history of metallic fragments, claustrophobia, or a weight of above 300 lbs) * Taking medications that affect the central nervous system other than antidepressants (stable dose allowed due to high rates of use among teens with depressive symptoms) or stimulants if required 36 hours before the scan. * Completion of Chatroom Interact Task or TBO Task in prior studies * Screening positive on the Autism Spectrum Screening Questionnaire, or screening positive on the Youth Inventory-4/ for a potential psychotic disorder or substance use disorder.