No. It is an operating system kernel.
Sure it can, and its the default browser of ubuntu-linux
Yes. Web-based email can be accessed from any modern browser, including those available for Linux.
google chrome and firefox
Yes. Phone Burner is web based and can be used from any compatible web browser.
Linux has several web browsers available, including Firefox, Konqueror, Dillo, Links, Lynx, Kazekhase, and Amaya.
It already can. There are some fax machines on the market with linux drivers. There is also linux based software that can run a computer-based fax (many fax servers run on Linux). There are also online fax services that will work on Linux through the web browser (they don't run "on the os" but they are fully browser-friendly).
Linux has a large and healthy variety of web browsers. Mozilla Firefox is equally popular on the Linux desktop. Opera also has a decent following on Linux. Konqueror, which uses a rendering engine similar to Safari and Google Chrome, also has some usage. There are lots of smaller web browsers, such as Dillo, Lynx, or Arachne, that are sometimes used in less powerful computers.
Unity Web Player is not developed for Linux and cannot be run natively. It is possible to use it by installing a Windows version of a web browser (such as Firefox) using Wine.
For hosting a Wordpress blog? Linux, easily. Linux just plain does servers better than Windows. For writing to one? It really doesn't matter. All that's relevant is the web browser, here.
IPv4 is not a program, it is a protocol. To browse a website, install any compatible web browser.
No , weblooker is not a web browser :)
If you mean os, no you can download it on Windows, Mac, and Linux even (if anyone uses linux...) and if you mean web browser I think you may use any but might need java.