Spam comes in many shapes and sizes, not just in a metal tin. 30 years back, the most popular spam platforms were limited to postal mail, telegram, poster, flyer and cold calling. With the rapid increase of computer, tablet and smart phone usage, spammers are migrating their focus to email marketing, mobile SMS (Short Service Message), social media message, virus spam and web spam. The infographic below describes how SPAM has evolved over the centuries.
Infographic source: www.marketo.com