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Firewalls are used to prevent users. The users will not be able to see the blocked content then.
Nextbook
notifies users that new content has been added to a specific website
The next-gen, pay-as-you-go CDN takes your data and places it on many servers around the world so that your content can be delivered to the user as quickly as possible. CDN is a content delivery network that is a globally distributed network of proxy servers that delivers web page content to users.
Because it will help users to find your blog and your content will reach your targeted users.
Wikipedia
Scalable
Great! I managed to find the answer myself. Users cannot switch the QWERTY keyboard to multitap keyboard in the iPhone. They need an app called MultiTap Text to do the trick. This app can help users type the text content with the Multitap keyboard and it lets them SMS or mail the content straight from the app.
A content distribution network is used to serve content to users with high availability and performance. You can learn more about this at the Wikipedia.
I wouldn't classify it as either. I would call it something like a operating system (OS) extension. There are all kinds of servers, including web servers, fax servers, file servers, print servers, database servers, etc. Each represents something that provides a service to users who request the service. A web server simply provides web content to users who request it...
Embedded references in hypermedia documents are called hyperlinks. Hyperlinks are clickable elements that direct users to another resource, such as another webpage, document, or multimedia file. They are a fundamental feature of the web that enable users to navigate and interact with content easily.
Basically just sets access levels of users or classes of users to different content on network devices.