Recently, Yu Jianrong, a professor of the Institute of rural development of the Chinese Academy of Social Sciences, launched a micro blog called "taking photos to save children begging" on Sina Weibo, which attracted the attention of netizens and public security departments all over the country. Netizens have uploaded photos of begging children to Weibo, hoping that parents with missing children can use this information to find their abducted children. Guangzhou's Public Security Bureau said it had paid attention to the microblog of "taking photos to rescue begging children". At the same time, police remind netizens, if found begging children suspected of being abducted, please dial 110 immediately. (information times, February 6)

The Internet has brought great structural changes to the whole human society. As a new Internet application, microblog has the functions of both tools and media, so it can not be ignored in the construction of public sphere, social communication, media interaction and mobilization. In this regard, the blue book "analysis and forecast of China's social situation in 2011" issued by the Chinese Academy of Social Sciences also pointed out: "micro blog is changing the pattern of public opinion carrier on the Internet in China. Micro blog has gradually developed into a new media involved in public affairs, and has become one of the most influential online public opinions."

The charm and strength of microblog have been shown incisively and vividly in some public events in the past. The Internet in the United States can set off a storm in the world political arena. In the event of "Yihuang demolition and self Immolation" in Jiangxi Province, microblog directly promoted the development of public opinion. It made the follow-up stories that might not have been published in the newspapers into a major event of national concern. According to a survey conducted by China Youth Daily in August 2010, "get to know the latest information" has become the preferred application for people to use microblogs. 87.3% of people said that they would express their opinions on public events on microblogs. Correspondingly, more than 95% of the "hot topics" on microblogs of several major portal websites involve public affairs, among which social public affairs account for the largest proportion, accounting for 78% of all hot topics.

For example, in addition to broadcasting natural disasters and rights protection, the vast majority of bloggers choose to avoid political and public affairs topics involving institutional and social sensitive issues, and the tendency of micro blog to be entertaining is obvious. In addition, microblog itself limits the number of words, which makes the discussion topic fragmented and emotional. If microblogging can't become a public platform, it won't be long before it disappears. As a result, Weibo's description of the variability of the fact itself can easily evolve into a widespread rumor. Therefore, to actively participate in public affairs, on the one hand, we need to actively encourage and support, on the other hand, we need to strengthen guidance.

People are in awe of public power and yearn for celebrities. Because of this, most of the microblogs of government agencies and celebrities will have many "fans". As long as they participate in the topic of public affairs, even if their opinions are ordinary and popular, or even if they just make a little unintentional comments, they will be spread by their huge "fans" group. Professor Yu Jianrong launched the micro blog activity of "taking photos to save children begging" which attracted the attention of netizens all over the country. It is precisely because Professor Yu Jianrong is a celebrity and also benefits from the attention of local public security departments. It also provides a good idea for us to guide microblog to participate in public affairs.