Ask HN: What are your thoughts on an opinion tracker?

This is not a startup idea, I'm just looking for a pet project to work on and I came up with an idea that sounds promising to me. I wanted some feedback on it.

The idea is basically a journal of your opinions. I'm imaginaning connecting this with various different social media and other journaling apps so there won't be too much to deal with. For the moment I'll take Twitter as an example, since people tend to post their opinions there anyway. By tweeting something like "I think Brexit is stupid", you can record an opinion on a topic, and then watch it grow and change over time. You can add sources, reasons why you think the topic is important, track your confidence in that opinion, etc.

I'll flesh this out and come up with designs a bit later, but right now I'm just looking for basic validation of this idea: Does this sound cool? Would you use it? Why or why not?

Thanks in advance!