It is easy to unblock myspace where it is blocked. You can use a Proxy server to access Myspace. But most of the cases Proxy servers are not highly anonymous. The best way still now is using a Web based Proxy servers.
What is a Web based Proxy Server?
Web based Proxy server is no different than a simple webpage as we see regularly. But it has a script which let you browse other website through it. So your Local ISP, the website you are browsing can’t detect your actual identity. You become fully anonymous. In some places some websites are banned to be accessed by the minors. You can use Web based Proxy servers to access the website in that place.