Just saw today that twitterfeed and bitly are now one. I've noticed for a while now that using twitterfeed is a sure way to get accounts banned and it's widely known that bitly hangs out of twitter back pocket so that's a spam door closing. But not alls lost. Get yourself your an adfly clone script, create your ads in the intersitual mode and then create a dlv.it account and set it up to use your own url shortener. I've done this a lot with cpc advertisers which works great and you are out of the twitter loop and your not using a recognised shorter, I'd also suggest to create a backup url shortener in case your first one gets a ban.