not more than a transparent internetconnection
Nope, although private servers can.
yes
You can circumvent one by using a proxy server, but unreliable proxy servers have been known to upload malware, adware, spyware, and even viruses. Generally if you don't know how to do it safely, you should probably stick to what it will let you see.
Through proxy servers. You can access them through various websites.
There are many proxy servers. squid danted privoxy tinyproxy
bestproxyserver.com or publicproxyservers.com. On public proxy servers, you will be able to find many proxy servers that may suit your needs. If you need a bigger selection, you can try zend2.com
There are a list of proxy servers you can visit that will allow you to get into Facebook and other sites. Some of the proxy are listed below. Proxy4u.eu weproxyinfo
Well… Generally school districts have Proxy Servers. These Proxy Servers can be changed by going into preferences on Safari or Firefox. Safari is usually a bit tougher, how ever Firefox is usually easy to change. The thing is, if you actually do change the proxy server you can be arrested. So don't try to play RuneScape at school by changing the proxy servers. Also, if you change the Proxy Servers you can watch stuff on youtube, or any other site. I don't recommend doing so though.
Proxy servers are useful for serving Internet pages, so for example if a user request the same page more than once they the proxy has cache of that page and serves your browser. Another thing is that the proxy can be used for security and in these case its between your browser and the WWW.
increase security
One may want to use a proxy servers if one wants to block certain cookies, ads, or even mask the type of browser one may be using. There are plenty of reputable proxy servers, so it important to search for these.
many proxy servers are blocked and most proxy switching programs do not cover all traffic just HTTP but if you wind a good proxy switcher and a unblucked proxy you can but that is extremely hard to do