[rkuykendall-com]

You don't. Just like when you're browsing HN and you get a message you don't want to swap to another app to answer it. That's why the separated Facebook chat app uses message bubbles that you can answer in any app:

http://cdn.cultofmac.com/wp-content/uploads/2013/04/Screen-S...

Honestly, it's brilliant, and the sole reason I use Facebook chat for most of my communications.

[mcintyre1994]

I had no idea they'd managed to make that work for iOS, that's awesome. Definitely agree, FB chat bubbles for Android are one of the best user experiences I've seen.

[aianus]

AFAIK, on iOS it only works within Facebook's apps. Pretty lame experience compared to the Android version.

[rkuykendall-com]

Oh wow, it never occurred to me that it would be Android only. iOS users are REALLY missing out. It's the best mobile chat experience I've ever had.

[Killswitch]

I have that in my current facebook but I do not use the messenger app at all or have it installed.