Seeing people using dated social icons bugs me...it's silly, I know, but it does.
To me it just feels lazy on the developer / creative's part...it takes two minutes to skim through the resources sections of the major sites. News of a "new brand" for X gets plastered every where for hours after it's announced...so it's not a secret. So come on, it might feel like you're selling your soul when you slap social icons on your work, but let's at least keep on top of the branding.
I'm posting this to Forrst because it is by far the worst offender. I cannot count the amount of times I've said "the lowercase t isn't Twitter's brand, it's the bird"...it's likely you're reading this post because I've said this to you.