Streamen von Twitter-Daten
TwitteR von Jeff Gentry
Link: https://cran.r-project.org/web/packages/twitteR/index.html
Twitter API
Link: https://dev.twitter.com/streaming/overview
Quick and dirty: Google-Suche ("Googleology is bad science")
GoogleTrends
Link: https://www.google.com/trends/
Google NGRAM in GoogleBooks