Task: Post latest Twitter mentions to Slack

n8n workflow JSON:
{"id":"1","name":"TwitterWorkflow","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","disabled":true,"position":[400,850],"parameters":{},"typeVersion":1},{"name":"Filter Tweet Data","type":"n8n-nodes-base.set","position":[680,300],"parameters":{"values":{"string":[{"name":"Tweet","value":"={{$node[\"n8n.io mentions\"].json[\"text\"]}}"},{"name":"Tweet ID","value":"={{$node[\"n8n.io mentions\"].json[\"id\"]}}"},{"name":"Tweet URL","value":"=https://twitter.com/{{$node[\"n8n.io mentions\"].json[\"user\"][\"screen_name\"]}}/status/{{$node[\"n8n.io mentions\"].json[\"id_str\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Only get new tweets","type":"n8n-nodes-base.function","position":[910,300],"parameters":{"functionCode":"const staticData = getWorkflowStaticData('global');\nconst newTweetIds = items.map(item => item.json[\"Tweet ID\"]);\nconst oldTweetIds = staticData.oldTweetIds; \n\nif (!oldTweetIds) {\n  staticData.oldTweetIds = newTweetIds;\n  return items;\n}\n\n\nconst actualNewTweetIds = newTweetIds.filter((id) => !oldTweetIds.includes(id));\nconst actualNewTweets = items.filter((data) => actualNewTweetIds.includes(data.json['Tweet ID']));\nstaticData.oldTweetIds = [...actualNewTweetIds, ...oldTweetIds];\n\nreturn actualNewTweets;\n"},"typeVersion":1},{"name":"n8n.io mentions","type":"n8n-nodes-base.twitter","position":[480,300],"parameters":{"operation":"search","searchText":"@n8n_io","additionalFields":{}},"credentials":{"twitterOAuth1Api":"Twitter Credentials"},"typeVersion":1},{"name":"RocketChat","type":"n8n-nodes-base.rocketchat","position":[1150,300],"parameters":{"text":"=New Mention!: {{$node[\"Filter Tweet Data\"].json[\"Tweet\"]}}.\nSee it here: {{$node[\"Only get new tweets\"].json[\"Tweet URL\"]}}","channel":"general","options":{},"jsonParameters":true},"credentials":{"rocketchatApi":"Rocket Chat API"},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[270,300],"parameters":{"triggerTimes":{"item":[{"mode":"everyX","unit":"minutes","value":1}]}},"typeVersion":1}],"active":false,"settings":{},"connections":{"Cron":{"main":[[{"node":"n8n.io mentions","type":"main","index":0}]]},"n8n.io mentions":{"main":[[{"node":"Filter Tweet Data","type":"main","index":0}]]},"Filter Tweet Data":{"main":[[{"node":"Only get new tweets","type":"main","index":0}]]},"Only get new tweets":{"main":[[{"node":"RocketChat","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[]]}}}