When posting a new comment, you can enable a new functionality for users to directly mention the author of another comment in WordPress. The feature is similar to popular Facebook and Twitter mentions, comments can use “@” symbol. Mention comment’s Authors by Wabeo lets you enable this functionality in a very easy way.
You must have observed this feature on Facebook. Facebook Poke is an old feature of Facebook. Now you can enable Poke in your BuddyPress site too. BuddyPress Poke is the new plugin by Anu Sharma. The plugin simply activates Poke in BuddyPress that enables your community members to poke other members, just like Facebook.
Other user profile
Poke back screen
Simply install and activate the plugin. Upon activate your logged in members will be able to poke by visiting other users profile and using poke button.