Facebook Credit Question / Stock Options

Hey guys!

Thoughts on FB up’ing there credit facility to a total of $8B from $2.5B as noted in their updated prospectus? Are they covering the tax liability for their employees stock option vesting or do they share in a portion of that tax liability?

http://www.nasdaq.com/article/facebook-adds-25-underwriters-to-ipo-expands-credit-facility-20120307-01595

“Facebook said it has doubled its revolving credit facility to $5 billion and secured a $3 billion bridge loan to cover taxes for employee stock grants for a total of $8 billion in financing.”