Easy way to see if my proxies are twitter banned?

So I just got Tweetattacks and a squid subscription.

I loaded up a couple accounts and some Squid proxies but one account couldn't seem to connect to twitter through one of the proxies.

Is there an easy way to run all my proxies to see if they are twitter banned?

can you put them on firefox and see what twitter.com is saying when you enter the site. The problem with squidproxies.com si that they don't chane their Ips and in time the get banned to many sites

Thanks!