List and explain the four major methods for billing online advertising.

Cost per click $-$ a concept where advertisers don't pay unless someone clicks on their ad Cost per thousand impressions $-$ the amount charged every time an ad appears $1,000$ times.

Cost$-$per$-$action $-$ A method for charging for advertising whenever a user responds to an ad by performing a specified activity, such as signing up for a service, requesting material, or making a purchase.

Exclusive advertising $-$ Purchasing all ads served on a site's main page $-$ securing exclusive access to a region of the page

All can be billed based on flat rate, sRem, cRac or any combination metrics.

$2.$ Watch the $17\mathrm{.}2$ video on "How Ads Follow You around the Internet". How has Facebook done an end run around the so$-$called ban on third party cookies? One of the people interviewed for this video invented the cookie at Netscape over twenty years ago to bring memory to the Web. He suggests that today the only way tracking can be controlled is with government regulation. Why?

$3.$ What risks does a firm face if it chooses to offer free products and services, subsidized based on data collection, data sale, and advertising? What steps can and should be taken by a firm that seeks to offer free services in this way? How can a company mitigate these risks?

$4.$ Many firms share their privacy policies online. Explain an example of a company that you think has implemented effective privacy policies and clearly engaged with consumers on them.

$5.$ Watch the $17\mathrm{.}5$ video on data privacy regulations. What are the consumer's three rights outlined in GDPR $($General Data Protection Regulation$)?$ In handling consumer requests based on the first twa rights, what is perhaps the most challenging task for businesses? Which criteria does a firm have to meet to defend itself in a GDPR civil action?