Drawing attention to food safety issues of one multinational undoubtedly has a knock-on effect of promoting restaurants that exist as alternatives.

FORBES: KFC's Midlife Crisis in China

The filters might be great for users, but they could have a negative effect on companies that have sunk money into promoting their pages and gathering fans, said one analyst.

CNN: Facebook revamps site, tweaks mobile apps

Many students of climate change argue that, although the artificial release of greenhouse gases such as carbon dioxide works to raise the global temperature, particulate pollution should, by promoting cloud cover and thus reflecting solar energy back into space, have a compensating cooling effect.

ECONOMIST: Weather and pollution