On his budget, I could see him investing a few hundred into Facebook with the intention to stay and hold, but anything beyond that is silly gambling.
The stock is being sold at nearly 25 times sales...Amazon is selling for about 2 times sales. Seriously? This is just a get-rich scheme for current Facebook shareholders.
Not saying anything is wrong with it. But you should definitely wait to invest until after the pop and the prices slide back to something reasonable.
Also, the OP has no business investing in stock right now. Unless you have 10k to throw around as disposable income, investing should be off the table.
3k is almost starving and homeless territory. Pay off your debt and get a part-time job.
Could work...I would say $6,000 in the hole - $500 will not really change your predicament?