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US immigration agencies read visa applicant's social media
(www.theregister.com)
This is a most excellent place for technology news and articles.
It isn't like there is a shortage of people who want to come here. We can afford to be a bit picky.
Like all things moderation. I dont think we really should care in your hypothetical nor do I think if someone says some comment on Twatter ten years ago criticizing a part of US foreign policy that it should be held against him.