Actually, the numbers already jumped in the previous days up from about 500 to 1500 with the ability to open the new accounts with no code:

newbyday 2011-12-09 740
newbyday 2011-12-10 597
newbyday 2011-12-11 433
newbyday 2011-12-12 544
newbyday 2011-12-13 720
newbyday 2011-12-14 1329
newbyday 2011-12-15 1158
newbyday 2011-12-16 4621
newbyday 2011-12-17 4356
newbyday 2011-12-18 2047
newbyday 2011-12-19 1668
newbyday 2011-12-20 2518
newbyday 2011-12-21 21903
newbyday 2011-12-22 34257

All of this in the last two days is purely Livejournal exodus, with maybe an extra 1000 or 2000 of people from this site looking to create secondary jornals.