twaining for twitter

I've been reading up on Twitter the past couple of days. It's time to expand my social media scope once again, and since the big T has yet to grace my computer screen, I figure it's time to dive in. So, fellow business owners...do you Twitter? Do you feel it's helped your business? What resources do you recommend for learning the ropes? Who do you follow?

single vs. double spaces

For quite a while now I find myself succumbing to the trend of using one space after periods rather than the traditional two spaces. It seems many folks are going this route, and some guidelines even specify to do so. One of my LinkedIn groups recently debated the issue here.

Some are in favor of the single space, some are attached to double spacing, and some are ambivalent. What's your take on the issue?