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Do the IOUs posted on WeChat have legal effect?

The IOUs posted on WeChat are legally effective if they meet the following conditions: the actor has corresponding capacity for civil conduct; The actor's will is real; The content of the iou conforms to laws and regulations and public order and good customs; Other conditions for the entry into force of laws, etc. The form of contract can be oral, written and other legal forms, and IOUs are also a kind of contract.