Hard to make money yet; but can be a good complementary tool
Intended and unintended consequences on your career
Increased visibility: good for some things, bad for others
Can easily turn into an important pundit whose opinion is sought
Can be a very easy break into mainstream media—a great career in journalism
Can eventually write a book, like most famous bloggers do!
disclaimer: I've done my best to attribute slides, graphs and screenshots used in this presentation. Nobody is perfect, and some of them may have slipped in unclaimed – apologies to the original right holders. Let's hope that my frivolous use of your graphs or tables falls under fair use ;-)