When does facebook stock go public?

[Y U NO GIVE GOOD ANSWERS?]

Easy 5-star answer. I want to know when it'll hit the market, and how much it will cost (estimated). I can't find this stuff online. Please include a link to your source if possible. Thank you.

[Bob S]

The actual date won't be set in stone until near the trading date, because it could slip for a number of reasons.

However, the rumor is that the stock will start to publicly trade on May 21st.