To deal with an ever growing number of users, Twitter limits each user to a maximum of 70 connections every hour.
Twitterrific makes three requests every time you refresh (for your recent messages, replies and direct messages.) By default, Twitterrific refreshes every three minutes, using 60 connections in total. That leaves you with 10 other connections for posting or manual refreshes.
If you post a lot, you may want to increase the update interval to 5 minutes.
Another thing to be aware of is that these connections are for all applications that user Twitter. For example, if you have a Twitter application on your iPhone in addition to Twitterrific, both will be using connections and you may run out.
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