Realwire’s CEO Adam Parker (@adparker) has given TweetReach a thorough going over. In a post on his blog he’s spotted that the tool crucially de-duplicates shared connections in a network to measure reach, exposure and impressions.

The free tool scans your last 50 tweets beyond that you need to pay. But ultimately Parker concludes that TweetReach’s application as a measurement tool is constrained by the Twitter API limit of seven days and 1,500 tweets.