lexipixel - 3:35 am on Nov 15, 2012 (gmt 0)
It closed up $2.50.. maybe the biggest single day gain (percentage-wise), not sure...
Wednesday November 14, 2012: (Close)
Nasdaq: FB $22.36 +2.50 (+12.59%)
Volume was massive, 230M shares traded, while average volume is in the 50M range.
A Reuters article explains
Investors relieved by absence of insider selling
"as investors breathed a sigh of relief that expiring trading restrictions on a huge block of shares failed to trigger an immediate wave of insider selling."
..it's ok to go back in the water -- I haven't seen a shark come by in at least 5 minutes...