6# sherman_shi

http://data.giss.nasa.gov/

Twitter is blocked at China, so you might need to find the data from other website. Like  http://snap.stanford.edu/data/twitter7.html

BTW, sina's microblogging is very good. You can just scrape the webpage (by R or Python) to get the data. Of course, you need some skills of natural language processing to make it usable.

多谢指点，不过一时难以消化，特别对Twitter感觉新奇，接下来慢慢看看。
7# ltx5151