Them, via FB Messenger, 9:32am:

Please ,I was trying to login in my instagram page on Facebook my new phone and they ask me to find someone to help me receive a code, Facebook gave me two friends suggestions and you one of them, the other person isn't online. will you Help me receive the code please?

Me:

I'm sorry you're having trouble logging in! Just so I can make sure your account hasn't been hacked, how did we meet?

Them:

[Calls me over FB Messenger, audio isn't working but it does look like them. I'm completely convinced at this point.]

Me:

Audio wasn't working, but I did recognize you
What do you need me to do?

32665, over SMS:

NNNNNNNN is your Facebook password reset code [this number has previously sent me FB resets]

Them:

Send me the code sent to you minute ago

Me:

Hmm, those look like the code to reset the password to my account?
Can we call again?

Me:

[I try to call them back, doesn't go through]

Them:

Nahh it's for my instagram

Them:

Having bad connections here

Them:

Send me the code ?

Me:

sorry, I'm still worried your account has been hacked -- can we do another call?

Them:

[Calls me over FB Messenger, audio is still not working, and the video feels slightly off. Ends quickly on their end. Possibly it's even the same video from last time?]

Me:

We're you able to hear me?

Them:

My connections

I've reported their account as hacked.

Things that made me suspicious:

• I don't think FB has any sort of account recovery that looks like this

• This is exactly what an attempt to hack my FB account would look like

• 9:30am, even though that makes it 6:30 where they live

• Video call didn't have any audio

• They couldn't receive incoming video calls

• Text did't feel like them, though I don't know them that well.

Here's a screenshot I took during the second video call:

Even with all those things, the video call would normally have been very convincing, and it did briefly convince me. I could easily see it fooling someone who didn't know about deepfake video.