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Chatter API to Post message from external system into Salesforce

Can some one please let me know how we can use “Chatter API’s” to post messages from external Systems on a specific Record in Salesforce
Considering the external system is aware of Salesforce Record ID.
And once we receive a post from external systems into Salesforce update some field on that specific record. (example" set the status of the record in Salesforce to "Received")