Self-media refers to an ordinary citizen or organization that can access the network at any time, any place, and in any way, and is connected with the global knowledge system through modern digital technology, and provides or shares their true views. Ways and instant communication. According to the above definition, which of the following acts does not involve self-media? ['Professor Zhang uploaded his courseware online for students to download.', 'Li discusses food hygiene issues with netizens on Weibo.', 'Xiao Zhang emailed the "Chinese-style Crossing the Road" to netizens.', 'Lao Liu browses the news about the Spring Festival on the forum.']