The company Big Day operates a website called "YourdaybyDesign.com" which allows you to create your own engagement ring. As an additional bonus the site then allows you to email a picture of your ring to friends and relatives. This has two purposes, it allows your friends and family to share in the excitement and also informs them of the websites existence. Big Day is using $\_\_\_\_\_\_\_\_.$

Group of answer choices

Location$-$based social networking

Viral marketing

Stealth marketing

Direct marketing

Virtual marketing