<sod >Writing in a Facebook post last week, Generation Identity, a British white supremacist group, said Austrian activist Martin Sellner and his American girlfriend Britanny Pettibone, who is a YouTuber and author, were detained by the British government.< eod>< sod > Writing in a Facebook post last week, Generation Identity, a British white supremacist group, said Austrian far-right activist Martin Sellner and his American girlfriend Britanny Pettibone, who is a YouTuber and author, had beenÃÂÃÂ detained by the British government on Tuesday.< eod>