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You would expect that the largest number of "Happy New Year" tweets would in every part of the world would appear around the midnight of December 31. But can we nicely visualize the live stream of tweets and see the tweets live as the old year comes to its end? I'll talk about a project I did for New Year's Eve 2015-2016 that does exactly this! It uses Twitter's streaming API to get a live feed of tweets, Bing maps and MapQuest to geolocate users without GPS coordinates and Suave.io with WebSockets to feed the data into a D3 map displayed in the browser. You'll learn about writing scalable web servers using Suave.io, reactive event handling with F# agents and Observables and how type providers, once again, saved the day!
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Tomas Petricek is a long time F# enthusiast, using F# since the early Microsoft Research versions. He has been a Microsoft C# MVP since 2004, and together with Jon Skeet wrote Real-world Functional Programming which explains basic functional concepts using C# 3.0 (teaching F# alongside) and which shows several appealing real-world uses of F# and functional techniques. He also contributed to the development of F# during two internships at Microsoft Research in Cambridge.