2 Logins at Once?

If you log in to an account frequently from familiar devices and IPs, the trust score of those connections will be high, and Facebook will accept simultaneous access. The problem only arises when you log in from a completely new device or IP, or an environment that is considered risky, then Facebook will ask for verification to ensure it is really you.
 
Similar to logging in on both your computer and phone. You just use and interact with your account on all devices. acebook may ask you to verify some initial information, but it's pretty simple.
 
You can log in on 2-3 devices as long as you stay active on all of them. Facebook may ask you to verify some initial information,
 
Yes, absolutely, Facebook allows you to use the same account on:

1 phone + 1 computer browser

2 computers

1 computer + 1 emulator (BlueStacks, LDPlayer)

... and still work normally

But the important thing is:

The usage behavior must be similar to a real person.

Avoid operations that are too fast, too unusual, or unnaturally duplicated
Does this work? Can you be logged into one account on 2 different devices and using FB on both with no problems?

What if both IPs are different? What if both IPs are the same?
 
Facebook only suspects when you log in to multiple accounts on the same device. It is completely normal to log in to one account on multiple devices.
 
Does this work? Can you be logged into one account on 2 different devices and using FB on both with no problems?

What if both IPs are different? What if both IPs are the same?
Yeah, you can be logged into one Facebook account on two different devices at the same time without much issue. If the IPs are different, Facebook might notice and sometimes ask for extra verification, but it usually lets you through. If the IPs are the same, it’s even less suspicious because it looks like the same user. Problems happen if Facebook thinks there’s suspicious activity, like sudden location jumps or too many actions too fast. If you want to avoid headaches, an agency account designed for this kind of multi-device use can make things smoother and safer overall.
 
Yes, you can use one Facebook account on two devices; different or same IPs usually don't cause issues unless activity looks suspicious.
 
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