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Both the IP of the server and the account are white listed. Which gives me 40.000k lists to monitor (without counting that some people monitor the same list).

I would be more than happy to have this kind of scalability issue. Hopefully I'll make it to YC and have de facto preferred access to Twitter APIs. Fingers crossed :-)

We are white listed by Twitter. Which up lift your limit from 150 to 20000 requests per hour. See http://apiwiki.twitter.com/Rate-limiting

I guessed as much. Any plans for what to do when you have more than 20k lists to monitor?

How are you pulling in all the tweets from the lists - won't you run into an API limit?

Ask for feedback: Google Alerts for Twitter Lists - Listiti.com