Inclusion Criteria:  18 years old or older Fulfill the DSM-5 criteria for social anxiety disorder (Score > 60 on the self-assessment instrument LSAS-SR) Have access to a computer/smartphone/tablet with internet connection Be able to read and write Swedish.  Exclusion Criteria:  Suicidal (within the previous month, assessed with the self-assessment instrument C-SSRS) Partaking in psychological treatment Ongoing treatment with psychopharmacological drugs with dose adjustments within the nearest month or planned dose adjustments.  The following self-reported diagnoses are excluded:  Autism spectrum disorder Serious depression (Score ≥ 20 on the PHQ9) Indications of psychosis or bipolar disorder (type 1 or 2).