To be honest with you - I don't know if this diagram is correct, or not - I've never considered Twitter to be on the top of the Social Hierarchy Pyramid, but some one must - or else this diagram in The Hierarchy of Social Marketing
would not exist:

To say that "Blogging" is on the bottom and "Twitter" is on the top, seem arbitrary - maybe RSS should be at the Bottom, then Social Search, then Blogging, etc - that I could see more.

And I guess, comparing Social Media with the Hierarchy of needs is a stretch, but I like where John Jantsch is going with with his comparison - Blogging..to him, equates to Sex ..hm mm:

 … As Maslow theorized, the ultimate potential of your marketing or human self-actualization couldn’t be achieved until the most basic human psychological needs - breathing, eating, sleeping, sex were first met. (Yes, I’m about ready to compare blogging to sex.) In fact safety, love, and esteem all come before transcendence. Now, before I edge too close to the deep end here, I’m simply comparing what I think is a bit like progressing up the social marketing hierarchy.

 Ok, so maybe that's why I like blogging so much ….