To protect yourself from this factor all you need is only just a terminal and web browser (any web browser would do but I prefer Mozilla Firefox) Launch your terminal: Using curl command to and some arguments. In this case we use --user-agent -k -v e.g: curl --user-agent "AlienWare/X.10 [en] (X11; U; Linux 9.0.01 i6128)" -k -v <URLshortener address> For example we want to know that where does this URL redirect to "http://amzn.to/1zyUSnd" So, just head to terminal and use curl command with correct argument. You may check the URL redirect at the "Location" in the HTTP header. With these you can protect yourself and avoid from SPAM, XSS or whatever social engineering attacks that someone might want to extract the information from you.
==Rip all of them! It serve you well==