yes, you should. Firewall normally don't block outgoing connections so you should be able to access any website you want. But if you are behind a corporate firewall which also has "content filtering" or "site blocking" you may not be able to access that site, some companies do that to prevent their employees from accessing some sites.
Yes you can fist all sites on the internet even if you have a firewall. Firewalls block cetain connections to your computer and are totally controllable. I the firewall you has for some reason does block meeblog you can edit what i blocks by going to the fire walls settings. Also there are site where you can get around them.
Your firewall is a tool to help keep others from accessing your computer. It will not keep you from visiting a wesite unless it is programmed that way.