Whether to Twitter?

After celebrating my 1000th blog post, it's perhaps timely to consider whether I should undertake any other online ventures. Several people have advised me to give Twitter a go, but until now I haven't indulged, due to lack of time. And it has been suggested to me that perhaps Twitter wouldn't be of any real benefit.

Why would I get involved with Twitter? Ultimately, I suppose the rationale would be something to do with raising my profile as a crime writer. I don't have a vast publicity...