Question: when did the app tik tok come out
[{'answer': 'September 2016', 'provenance': [{'wikipedia_id': '56822861', 'title': 'TikTok', 'start_paragraph_id': 1, 'start_character': 261, 'end_paragraph_id': 1, 'end_character': 275, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]