Let us take a brief look at a few recent popular IPO's. One thing I want you to remember and understand is that most people like to jump into IPO's in the hype because they watch the news, get influenced by the noise, or use the product. Remember that you are trading stock here with the professionals. This is not a kids game anymore!
Most IPO's sometimes have a dumping period where people unload and cash in on shares who purchased it on the secondary market (before the IPO). Sometimes they can dump them a few months in, sometimes immediately, so read the reports.
However, don't jump in just because the stock "sounds cool." I have seen some of my friends jump into Facebook stock for example and that stock is just toast. Let the charts setup and be patient. Wait for them to show you and prove to you that they are good stocks to own! Forget the noise, turn off the TV, do your own homework, and make your own decisions.