You may have noticed this week that the Facebook logo on your app has changed.

It is rather subtle. It is not like a paradigm has shifted or anything, but the "F" icon is now this deeper shade of blue and slightly bigger.
Yes, Facebook is undergoing a rebrand, which of course comes along with a long, lojong-filled tale of how and why these, really, pretty minute changes came about.

According to Meta:

As we continue our evolution as an app and a brand, we're excited to launch the first phase of a refreshed identity system for Facebook, with a focus on effortless, self-initiated exploration and connection across every touchpoint.

Actually, Meta explains, "there are three vital drivers" toward this new vision:

Elevate the most iconic elements of our brand to create a distinctive, refreshed Facebook
Unify how the Facebook brand comes to life across product-to-marketing experiences
Create an expansive set of colors — anchored in our core blue — that is comprehensive and vibrant, and also designed to be more accessible for people
The only real thing of value is the access element, while the new Facebook logo itself takes a more solid, comprehensible feeling.

But those unnecessarily long descriptions are pretty funny as well:

"Our objective was to create a refreshed look at the Facebook logo that would be bolder, more electric and permanent. One of the unique new developments is pushing further consistency all throughout the design as core elements of the app identity. We have done so through a more forceful expression of Facebook's base blue color, one we designed to be more legible in our application with greater contrast for the 'f' to pop out more."

Yep. That.
It's also updating its reaction emojis, to "invoke more dimensionality and emotion".
So, in effect, if bits of Facebook seem more blue, or look a little different, they probably are, with Meta rolling out these new updates over the coming months.

So it's not just you, your eyes are not going funny; Facebook does look a little different. Which is also worth noting for your website displays and future logo usage.