My Internet Service Providers had blocked sites like meebo, youtube etc. Any way i can open these sites?

You can open these sites with the help of proxy servers....these proxy servers would be like webpages and you need to re-type the web address you are trying to open in the proxy server web page.

One popular proxy servers available are
http//www.kproxy.com

If your ISP blocked them, that is probably impossible (depends on how they implement it), You can also get another ISP.

hack the isp