The US government has now approved plans to ask US visa applicants for their social media accounts. Just recently, the Trump administration has started conducting background checks on the social media usage of visa applicants going back 5 years ago via a new questionnaire.
The development now also allows consular officers to request email addresses, phone numbers as well as 15 years of biographical information from visa applicants, should a “more rigorous national security setting vetting” is needed.
This may definitely make visa applications more difficult for lots of people.
The new questionnaire has a section where you need to write your usernames for any websites or applications you may have used to create or share content (photos, videos, status updates, etc.) as part of a public profile within the last 5 years. You can see the new questionnaire here.
For now, it is still voluntary to accomplish the questionnaire, HOWEVER, do note that “individuals who […] do not provide all the requested information may be denied a US visa.”
Moreover, the new questionnaire applies specifically to visa applicants who aren’t using the visa waiver program.
Additional source of info: BBC