Recruiter: Congratulations! Everyone loved you so we are looking to move forward with an offer. The level we are hiring you at pays, $x salary and $y in RSUs with a 4 year vest.

Candidate: Well, I have an offer from FB for $x++ salary and $y++ RSUs.

Recruiter: Let me speak with the hiring manager and see what we can do.

Looks like recruiter are updating that last line to be something like,

Recruiter: Can you forward me a copy of that offer letter and the name of the person who sent it so that I may verify its authenticity? After that, I'll speak with the hiring manager and see what we can do.