Hey . .i want to use Bitstamp to buy sell bitcoins. But it requires my personal identification, the images adderess proof and all. Is it ok to give it my personal id's. Or they will use my id in some illegal stuffs. What should i do? Also, is bitstamp, a legal? Not SCAM? For it give bitcoins at considerably lower than marketprice. 
Most exchanges requires that identity verifications. You can check their privacy policy to know what thy are doing with the details that you are giving them. https://www.bitstamp.net/privacy-policy/ Afaik they were hacked before but they are comoletely operational now. People still use them so I think it's safe. Any exchange is prone to hacking anyway.
Also please delete your other thread: https://bitcointalk.org/index.php?topic=1759014.0 No need to make a multiple thread with the same topic.