Pick one of the area of web mining

Web content mining $($such as Multimedia data type: Text $($Do not do text mining$),$ image, audio, video$)$

Web structure mining $($such as Semi$-$structured data: hyper$-$links and html tags$)$

Web usage mining $($such as usage, click pattern, web UI$/$UX analysis, traffic mining etc$)$

Briefly describe what is going on in that area and then go deep in one subtopic $($for example if you pick content mining and within that audio, look for what is going on audio content mining, what's the latest research and how people are using it $/$ commercializing it$.$ Your submission should have proper explanation in your own language with examples.