http://www.psfk.com/2015/10/google-patents-light-powered-contact-lenses-photodetectors.html


This article is related to internet communication because it is actively conveying the 
message, which happens to be about interactivity. In the article, the writer explains how Google has patented contact lenses which communicate with like lenses through blinking and other non-verbal ways. 
"The patent proposes using pulses of light invisible to the human eye which another device can read. Through photodectors installed, they can receive data or special instructions, too."
The lenses use Google servers to send, process and receive the message. The "cool" factor of the new technology will pique users interests and keep them interacting with one another. 

We can measure interactivity in web design by tallying the amount of users within a game or possibly by integrating an interactive map, oftentimes by even clicking a link. The point is to infiltrate your interface with interactive bits to keep the user or the consumer actively engaged in the content so that they feel as if they are in control. Taking these measure will keep them coming back and will, in turn, increase the interactivity of the site itself.