Those harboring doubts about micro-blogging should now be convinced that micro blogs can play an effective role in mobilizing society for a just course.

But professional journalists, while celebrating the great achievement of micro blogs, should double their vigilance over hoax news.

Around Jan 27, Yu Jianrong, professor of rural development at the Chinese Academy of Social Sciences, posted a micro blog message on Sina.com, calling on netizens to take pictures of child beggars so as to help rescue them.