Yesterday, Facebook began rolling out a new feature on its website to indicate whether a friend is available to chat on the web or on a mobile device. This feature has been implemented globally. Here’s what it looks like:
By letting users know if their friend is on the web or on mobile, it manages expectations about what type of response you get. For example, if your friend is on mobile, he or she will probably send short messages since typing on mobile isn’t as quick as typing on the web.
This feature brings Facebook chat in line with Google’s Hangouts, which displays which device a user is on using an icon..
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Source: TechCrunch