Washington believes equipment made by Huawei Technologies Co Ltd, the world's third largest smartphone maker, could be used by the Chinese state to spy.
Chinese civilisation is an "open system" that has continuously had exchanges and learned from other cultures, including Buddhism, Marxism and Islam, Xi told the forum.
The activist, who had been arrested several times towards the end of last year, fled to Malaysia as she felt unsafe after taking part in a symbolic act against the monarchy.
Apart from presidential candidate Senator Kamala Harris, another Democratic candidate, Senator Elizabeth Warren had also stressed upon the possibility of breaking up Facebook.