We are getting an update later today and it's going to add a very useful tool in my opinion. Here's a writeup about it:
Your @mentions call all the users to the yard (aka @mentions)
You've seen mentions on Twitter and Facebook. Now you'll be able to use them on your site to your heart's content.
@mentions will automatically be triggered in the rich text editor as soon as you type an @. When you do this, in the rich text editor, you'll see an autocompleting username drop down from which you can select a username.
This will insert an @mention into your post which links to the user's profile.
The @mention itself is a single object so if you backspace over it, the whole thing will be removed from your post.
The @mention is also available in the BB Code editor, through a new editor button, appropriately indicated by the @ symbol. This button brings up a dialog where you can enter a username.
In BB Code, users can also simply type the tags [@] and [/@] around the username if they prefer. On submit, this will turn into an @mention.
There's another very important thing that @mentions do - they will send an immediate notification to the user being mentioned. Woohoo! They're a great way for users to communicate with each other and page each other in posts. Huge engagement points. Just imagine getting paged by a user you know. That's an email you want to read and a post you want to respond to. Here's what the email will look like:
Please note: there will be options in your profile to turn this off in case you do not want to know if someone mentions you