I was just thinking, it'd be really easy to boycott online services. But with so many mergers, and companies are so big, you never know who owns what anymore.

So I was wondering, have anyone made any kind of web browser extension that lets you list a company and you put in why you don't want to support them and it gets all of that company's holdings, and hell even friends, and when you go to that website it pops up a warning reminding you why you hate them and a list of alternatives to support?