Online surveys: Consumers are asked to complete a survey, including their demographic information and product and lifestyle interests. This information is used as a sales lead for advertisers, who purchase the consumer's information if provided. The consumer may 'opt-in' to receive correspondence from the advertiser and is therefore considered a qualified lead.
Cost per thousand (e.g. CPM Group, Advertising.com), also known as cost per mille (CPM), uses pricing models that charge advertisers for impressions — i.e. the number of times people view an advertisement. Display advertising is commonly sold on a CPM pricing model. The problem with CPM advertising is that advertisers are charged even if the target audience does not click on (or even view) the advertisement.

Google Adwords still stand at the forefront for PPC advertising as indicated in the diagram above from the 2013 State of Paid Search Report. While many frown on paid advertising as a digital marketing tool, these experts believe that PPC ads is still a very viable and high quality resource for generating valuable leads and will most likely continue on this thread for years to come. New businesses can quickly generate their much needed leads using PPC ads, and veteran digital marketers will continue to make use of this important tool for generating good results that will push them towards their goals.
Leads may come from various sources or activities, for example, digitally via the Internet, through personal referrals, through telephone calls either by the company or telemarketers, through advertisements, and events. A 2015 study found that 89% of respondents cited email as the most-used channel for generating leads, followed by content marketing, search engine, and finally events.[2] A study from 2014 found that direct traffic, search engines, and web referrals were the three most popular online channels for lead generation, accounting for 93% of leads.[3]
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