marketing customers excluded those for our group-buying and delivery related businesses. Our online marketing customers consist of small to medium-sized
enterprises, or SMEs, throughout China, large domestic companies and Chinese divisions and subsidiaries of large, multinational companies. We have a diverse customer base in terms of industries and geographical locations. The top industries in which
our customers operate in terms of revenue contribution include retail and ecommerce, local services, medical and healthcare, network services, financial services, education, online games, transportation, construction and decoration, and business
services. Customers in our top five industries contributed approximately 50% of our total online marketing revenues in 2016. Although we have customers located throughout China, we have a more active and larger customer base in coastal regions,
reflecting the current general economic demographics in China. Our customers also include local merchants that act as advertisers or service providers covering businesses such as restaurants, hotels and cinemas, and advertisers of iQiyi, who are
counted as part of our online marketing customers, and subscription users of online video contents.
We reach and serve our customers
through our direct sales force as well as a network of third-party distributors across China. As many of our customers are SMEs, we use distributors to help us identify potential SME customers, collect payments and assist SMEs in setting up accounts
with us and using our online marketing services. We have also engaged third-party agencies to identify and reach potential customers outside of China. Customers use our products and services through PCs and mobile devices. Mobile revenues
represented 70.0% of our total revenues in the three months ended March 31, 2017.
Since early May 2016, we have been implementing new
measures to further improve customer quality and foster a healthy environment to enhance user experience and drive long-term sustainable growth. We have taken proactive measures requiring all customers on our platform to submit Internet Content
Provider (ICP) licenses and verify enterprise bank accounts. The implementation of new and stricter regulations on online marketing and our self-imposed proactive measures will have a short-term impact on our business. We believe these measures will
be beneficial in the long term, and we remain confident in our long-term outlook, underpinned by our fundamental value proposition of search and our ongoing investments in technology.
Baidu Union Members. Baidu Union consists of a large number of third-party web content, software and mobile application
providers. Baidu Union members can display on their properties our customers promotional links that match the content of such members properties. Some Baidu Union members also embed some of our products and services into their
properties. We allow Baidu Union members to provide high-quality and relevant search results to their users without the cost of building and maintaining advanced search capabilities in-house and to monetize
their traffic through revenue sharing arrangements with us. We reward Baidu Union members by sharing with these members revenues as a percentage of total revenues recognized by us. Because we have implemented measures to deliver a better user
experience and build a safer and more trustworthy platform for users since May 2016, the revenue contributed by Baidu Union members slightly decreased in 2016.
Content Providers. Our content providers mainly consist of video copyright holders, map data owners, apps owners who list their
apps on our app store for users to download, users who contribute their valuable and copyrighted content to our products, and self-media authors such as those who publish their content through Baijiahao accounts. These content providers contribute
rich contents and resources to our content ecosystem, and in return we provide a broad platform for them to present their content. If we generate revenue from utilizing third-party contents, we will purchase these contents or share revenue with the
content providers based on the terms of pre-agreed contracts.
Technology and people are
critical to our long-term success:
Technology. We focus on research and development and innovation. To stay at the
forefront of the internet industry and to achieve long-term growth and success, we invest heavily in research and development. We
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