Guangzhou has a huge industrial base, including the home of Tencent, the major digital communications giant that includes qq.com and Wechat.
Census data: http://www.stats.gov.cn/english/Statisticaldata/AnnualData/
The data include overall statistics on popular, business, and myriad categories for all of China and Guangzhou specifically. The data can easily be downloaded into Excel.
City government: http://english.gz.gov.cn/gzgoven/s3709/201008/787559.shtml
Compare Guangzhou prices and quality of life with other cities at http://numbeo.com
News and information: http://english.gz.gov.cn/gzgoven/index.shtml
United Nations: http://www.unhcr.org/5000187d9.html
World Bank: http://data.worldbank.org/country/china
China government: http://www.stats.gov.cn/english/
Oxford Journals: http://ije.oxfordjournals.org/content/31/4/772.full
Football rankings: http://footballdatabase.com/clubs-list-country/china-pr