A review which does not reflect the true and fair views of the writer

A review written by someone who had a bad experience with the product and wishes to warn other people 

A product that does not exist but nonetheless has a considerable number of reviews about it.

Group buying sites like GroupOn

Website advertising

E-catalogs

Price comparison sites

Using a photo of a desired product to conduct an online search

Using Virtual Reality technology to see a product which isn't physically present

Using a photo of a product seen online to identify the product in a bricks and mortar store 

A Web search where you describe the appearance of the product to find it

By clicking the ads in promotion e-mails the customer received

By looking on Amazon

By examining Google Maps to find nearby retailers

By personalized text messages sent via messenger apps

A buy-side marketplace

A reverse auction marketplace

A sell-side marketplace

An e-bartering exchange

Brazil

China

USA

South Korea

eBay

Alibaba

Amazon

Etsy

South Africa

Asia

Europe

Delivery times are less critical

Price and quantities of orders can be lower

Frequency of transactions can be higher

Contracts exist between buyer and seller before any transaction

The sale of goods in small quantities to consumers over the Internet

The sale of goods in physical stores to people who ordered online

The sale of goods in large quantities to other businesses over the Internet

The sale of goods in Webstores by companies which were originally bricks and mortar