Thank you for your kind words Rodney. However I don't think I'm the only person aware of the lockup expiry, as evidenced by the recent WSJ article (http://online.wsj.com/article/SB10001424052970204296804577124833343029236.html)
The next few days for GRPN should be interesting. Given that the stock has fallen so far in recent weeks, I have no position.
I'm thinking about selling some OTM calls, given that the lockup expiry today should result in significant overhang for the stock. But at this stage I'm too chicken to pull the trigger on the trade. Maybe if it declines on heavy volume then I might change my mind.