Copy the following snippet:
<meta name="twitter:label1" value="Reading time">
<meta name="twitter:data1" value="3 mins 🕑">
<meta name="twitter:label2" value="Recommends">
<meta name="twitter:data2" value="171 💚">
Paste it into Slack and hit send. (You can use @slackbot as a sort of sandbox if you don’t want to spam your team.)
You should see this: