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Unfortunately, the tool seems to be having some stability issues at launch (the above might not even load for you), highlighting the potential problem of embedding a tweet versus taking a screenshot –- you’re relying on the service to be up and running so that it can pull in the information, an area where Twitter hasn’t always had the best track record.
We'll see if the service, which appears to be intended primarily for media (it lives on Twitter's new media site), gains much adoption from blogs and news sites in the weeks to come.