Useful ruminations from Jacob Grier on why Twitter is worth it. I agree with his list (*1) And have to say that "socializing" was definitely not part of the equation from me when I started. Yes, I was trying to figure out how to get my books in front of people.
Like Jacob, I've ended up getting to "know" people I otherwise never would have known (or known about). Most important, however, Twitter has significantly expanded my intellectual realm of possibilities. And I mean significantly. I've run into and benefited from people a host of fields (science, journalism, lit crit, younameit). Plus I've been able to follow the ongoing "debate" among and between the food people in a way that I probably would not have without Twitter.
So . . . there you have, from me to you, at the end of a long day during which I continued my efforts to break the back of this chapter.
*1: Jacob was one of three two people who urged/persuaded, me to try Twitter. The other two were Jeff Alworth at Beervana and David Nygren at The Urban Elitist.) (Which, no, he's not updated recently. I gather he's involved in the move-and-remodel from hell.)