The first one is an interesting idea, but offering any real financial advice is regulated, which is a tread carefully territory
Second one is achievable and a good one at that. In fact, there is a lot of canonical data out there that when used carefully can provide a very nuanced picture of the current state of economy.
Third one, currently I have just a twitter account where the earnings reports are auto posted the second they are ready (that is, until I run out of free api limits). Their API cost for at the higher end makes it only viable if I am doing it full time and there was a clear edge by analyzing the data. My gut feeling is, most of the work will go into filtering out low signal posts idk