Breaking News: MediaSift (makers of TweetMeme) Licenses Twitter Firehose to Merge With Klout And Sentiment Data
Right now the service is in "Alpha" only and will be launched, per the news post, in Q3 2011.
The intriguing element here is that instead of dealing with the entire Twitter firehose through, for instance, the service that Gnip provides, with DataSift you will be able to filter the feed down based on keywords... or even Klout scores (or PeerIndex scores) and/or sentiment analysis.
This is where it could get interesting. You could then set up monitoring for tweets mentioning your brand name that had a negative sentiment and were from someone with a certain "authority" (remembering the issues with any such system). You could then act on those tweets in some fashion (sending out an alert, responding via Twitter, pinging someone via SMS). The key is that the filtering is done in MediaSift's cloud and you get to interact with an already filtered and merged feed.
Pricing was not disclosed in the announcement, although it was said that you only have to pay for the tweets with which you interact - and could also do that on a time-driven basis (i.e. for an hour). On the DataSift web site, there is a pricing page with little detail, but a pricing calculator may give some view into the pricing (if that price there is in US dollars. I can't tell from the symbol).
All in all it sounds like an intriguing service... now we just have to wait for it to actually be launched and publicly available.
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