Any fallout from this will be interesting. It can be easily argued that this is a case of the US President (not the US Government) using arbitrary emergency powers-—or the threat of their use—-to interfere with a business deal on behalf of a US company. Even ignoring suits from Facebooks’s competitors, effect on existing trade deals, and justification for foreign government interventions against US companies, one wonders if this is the start of a new trade war with China or just a warning to other social media companies (“nice market penetration you got there, shame if something were to happen to it“).