Go Daddy lost 21,054 domains yesterday in wake of SOPA PR disaster
thenextweb.com
thenextweb.com
According to The Domains, yes GoDaddy lost about 21,000 domains but they also gained roughly the same number of domains from other registrars on that day (and that trend held for other days this week where they "lost"). In other words, they don't have any significantly fewer customers today than they did a few days ago.
[1] http://www.thedomains.com/2011/12/24/2-days-loss-from-transf...
You will need to be patient to get any real numbers. The domain registration transfer process can take 3-5 days to complete, so it's improbable to actually know anything right now! Real facts on the success or failure of the boycott campaign will be seen in the upcoming weeks.
Also for better tracking of how many domain registrations may or may not have lost keep an eye on webhostinginfo's charts. Specifically the market share percentage: http://www.webhosting.info/registrars/reports/GODADDY.COM
Transferred In (20,034)
Transferred Out (21,054)
Deleted Domains (31,047)