Can you tell some good shares at ultra cheap rates to buy?

How can I tell whether these stock-based dealing websites (selling pre-IPO shares of Facebook, Twitter, etc.) are legitimate?

• The websites which are selling block of Facebook,Twitter and other companies are given below with the explanation which I think is fake and  is not legitimate.However I have contacted both of the firms to buy block of Facebook shares which are on boom and as these shares are entering quiet period after 18 days from http://now.So they have sent Letter of  Intent and now I feel that I should not buy the shares of http://IPOtrust.com,however I have serious doubts on http://privatestocktransfer.com *Please do the needful,put up all those things which are important here.*And good luck to all those who want to invest in. http://IPOTrust.com- The founder of this venture started this venture http://IPOtrust.com in 2009,when i searched IPOtrust on google I found the links of facebook,twitter.The updates on the facebook,twitter from IPOtrust are no more older than 4 months.Moreover the layout and design is good but I felt fake.The updates from IPtrust on facebook,twitterline seems fake also. http://privatestocktransfer.com-Same issue here as explained with IPOtrust

• Answer:

  Please consider using http://Sharespost.com or http://Secondmarket.com, both are registered broker dealers (BDs) who have transacted dozens of share transactions for FB buyers and sellers.