If yes,then you would like to consider making aliases of your gmail idto use when you're not sure whether you're signing up for something safe or not.It is a very simple task to provide an alias of your gmail id.Whenever you sign up on the internet on some site that you think may not be safe(or a site which might send you spam),all you have to do is give out the email address as

username+insertanythingyouwanthere@gmail.com

For example if your email id is rajesh@gmail.com you can provide hrithik+21@gmail.com or hrithik+test@gmail.com .

You can put anything after the + and all email sent will still go to your gmail account.In the event that you did give your email to a spammer and you start receiving spam,
don't worry!
Just create a filter, and make everything that is sent to username+whateveryouputhere@gmail.com
go to the trash.
This way all the spam that you might get will automatically be deleted.