A man caught carrying a knife had previously posted a video of himself holding a machete.
Jordan Craig, 24, is now behind bars awaiting sentence on the charges.
He admitted having an offensive weapon in Greenhills Square, East Kilbride, on September 24 then headbutting a police officer after his arrest.
Craig, of Parkfield, East Kilbride, was the subject of four bail orders at the time.
He also admitted sending threatening and offensive messages, and showing a video in which he was carrying a machete, on April 15, 2021.
Scott O'Connor, prosecuting, told Hamilton Sheriff Court that police received a call from a man at 9.15pm on September 24.
The caller said he had been threatened by a knife-wielding male in Greenhills Square and provided a description.
Officers went there and found Craig. He had a knife in his jacket pocket.
Craig was detained and taken to London Road police station in Glasgow where his behaviour became "aggressive and erratic".
The earlier incident involved a series of online messages sent by Craig to individuals between midnight and 3.30am.
He made threats, including to stab someone's dad.
One recipient came across a video in which Craig was holding a machete.
Craig has been in custody since his arrest in September.
Sheriff Liam Murphy deferred sentence until next month for background reports and warned the accused: "Given the nature of these offences and your previous convictions, custody will again be uppermost in the court's mind."
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