A ping is a way to get someone's attention with an animation and sound. To ping someone:
On desktop (MacOS and Windows):
Click Ping 
inside the conversation.
OR
From the menu bar, click CONVERSATION > PING or Click Command + K (on Mac OS X), CTRL + K (On Windows).
On Wire for Web:
Click Ping inside the conversation.
When you ping someone, they'll see a Ping in the conversation view and in the conversation list. The conversation will also move to the top of the list.
On mobile devices:
- Tap the conversation in the conversation list.
- Tap More
. - Tap Ping
.
When you ping someone, they'll see a Ping in the conversation view and in the conversation list.