The RSS feeds that Radio3 generates, starting in v0.75, have <cloud> elements. This means that people who subscribe to your feed in compatible aggregators will be notified immediately when you post a new item, and can show the news to readers immediately.
Here's my linkblog feed with rssCloud support, as an example.
Andrew Shell has released an rssCloud server for Node.js. We use his server for Radio3 feeds.
New in Radio3 v0.74, you can now push links to a Slack channel in addition to Facebook, Twitter and RSS.
The only tricky part of the setup is to get a magic URL from Slack that enables Radio3 to send messages to your channel.
If you click on this link, it will redirect to your Incoming Web Hooks page.
Choose a channel from the popup menu.
Click the big green button, which takes you to a page with a long URL on it.
Copy the URL to the clipboard.
Choose Settings from the menu at the right edge of the menu bar.
Click on the Slack panel. You should see a bunch of settings like this.
Paste your WebHook address in the first field.
Click on the first panel in the Settings dialog, and check the box for Slack.
Now your Radio3 posts will go to Slack.
We've set up defaults so your links will look like this when they arrive in Slack.
If you erase the default values in the Settings dialog, you'll get the Slack default values. Or you can supply your own icon, change the name from radio3.io to whatever you like, or use an Emoji to define your icon.