Ditto Q/A websites. By the way, you know they're essentially just massive funnels for low quality UGC to choke search engines with, right? (I will give an honorable exception to StackOverflow because some of their answers actually contain useful information that could not be gleaned from a Google search, and the embedded MMORPG is kind of fun.)
Put the content on your own darn page and disintermediate the middle man. (SEO is free (well, freeish) and effective, although it is neither quick nor particularly easy.)
Besides, the author's suggestions involve spending time answering and searching forums. Not my definition of "quick".
Maybe the title could have better indicated who was the intended audience: the startup truly just starting up.
Reading around a bit it is clear they fall into this category and are experimenting with different techniques and blogging about them. So maybe it wouldn't be worth the time investment for a startup even a bit further along, but maybe worth it for a startup to get their pageviews from 0 to...not 0.