We are a few years into the era of realtime data. Everyone is producing and consuming it, but there is still a huge need to filter it. For that reason, Mark Suster of GRP Partners is doubling down on Twitter by investing in DataSift , one of two companies with rights to re-syndicate Twitter's firehose of more than 200 million Tweets a day (the other one is Gnip). GRP and IA Ventures are investing $6 million in DataSift in a Series A. DataSift launched at TechCrunch Disrupt SF last year. It provides the full Twitter firehose in a way that can be mined, chopped up, analyzed, and mashed up with other realtime streams such as Klout, PeerIndex, Facebook, WordPress, and others.