Continue writing the next sentence in this paragraph:

How to unblock blocked sites
Find a good web-based proxy server.
Proxy servers act as medium, visiting a blocked site for your computer, then showing it to you. Additionally, your ip address and location are not tracked, so you effectively become anonymous online.
A good proxy service will not have too many ads or popups. Advertisements are very common and can be a big downside to using many free proxy servers.