Question: what is the purpose of bulletin board display
[{'answer': 'posting of public messages', 'provenance': [{'wikipedia_id': '270925', 'title': 'Bulletin board', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '270925', 'title': 'Bulletin board', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 718, 'bleu_score': 0.9832621206481431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11093358113837272327}, 'section': 'Section::::Abstract.'}]}]