Say what you want, but it looks to me like Trump has helped Twitter increase shareholder value over 130% over the last year. Given it took me a year of missing Trump's tweets to sign up, and knowing I'm not the only one, Trump's provocative tweets can only draw more users to Twitter. More users, more revenue.

That's been the way internet advertising has worked since I did it years ago. Provocative people draw attention, just like everyone slows down to see a car wreck, everyone has to see what Trump's going to say next.

Given Twitter's still down about 20% from it's IPO, I think Twitter is still a good buy right now.