You certainly can use Twitterfeed with Google Alerts. The basic difference with AlertRank is that it lets you manage your alerts and filter them by rank, so instead of sending all your alerts to Twitter you can restrict them to just the most influential. You can also identify each alert as positive or negative and filter them by that criteria. Of course, auto-tweeting is just one of the features of AlertRank. If you look at the public account listed in this post, you will see that you can also get analytics, produce reports, search through past alerts, identify key sources of alerts. There is a lot more here than just what Twitterfeed delivers.

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