I have noticed that many people have lost they're STEAM accounts, because somebody hijacked them.

Can anyone please tell me, what did you do, and how did that happened?

If you want to recover your steam account please follow this:

https://support.steampowered.com/kb_article.php?ref=2347-qdfn-4366

Step by step recovery. Remember don't join any sites which ask you for password,except OFFICIAL STEAM WEB.

Eliam