Inclusion Criteria:  live or work in Mumbai or Thane fluent in Hindi or English have had anal sex with men in the past one year report that they have either never been tested for HIV, are unaware of HIV test results, or are HIV-negative with last HIV test greater than or equal to six months ago, and have engaged in anal sex since last HIV test able to provide and verify a WhatsApp mobile number and email address willing to answer online surveys for 18 months  Exclusion Criteria:  participating in a concurrent HIV-related study intention to move out of the Mumbai metropolitan area in the next six months