What do you mean by net drill?

Mining or exploring information on the Internet to find and obtain useful content. Just like digging a well in reality, from the surface to the deep, it gradually goes deep into more core and more important information. This kind of behavior usually requires a lot of time and energy to successfully achieve the goal. For example, in-depth search is conducted on social media platforms to find and obtain valuable information, news and trends. It can be called a net drill.