Social media, because it is so destructive, both for the user, for everyone else and the whole society.
RISC-V resources
If you are making something that implements or compiles to RISC-V machine code, you might want to take a look at my RISC-V Instructions documentation where I tried to document all (soon) instructions in a convenient format so you can quickly look things up.
There is also common hardware optimizations and a list of system calls on Linux.
I also have a RISC-V assembler and disassembler for making simple things.
They only handle very few instructions but are easy to extend (use the instructions documentation linked above).