Peter Thiel says he and fellow Silicon Valley venture capitalist Marc Andreessen may not agree on terminology, but they have similar thoughts about Carl Icahn.
Andreessen later told CNBC that some activist investors were mentors while others, such as Icahn, didn't care much for the companies involved, a situation similar to the two good/bad versions of the captain of the star ship Enterprise.
In a letter a day after the tweet, Icahn said Apple shares were "dramatically" undervalued, and he wanted the company to buyback shares.
There's "always the perspective that these companies shouldn't be investing in technology, [that] they should be investing in their own share price," Thiel said. "That assumes that the iPhone will be able to maintain its monopoly-like profit margins for decades to come, and there's a sense that this is quite unstable."