I really want to know because I am a lazy bastard and don't want extra work. A lot of my writing pals have blogs and big up each other on their blogs and visit each other's blogs etc. And it's nice and I genuinely like the amount of mutual support they all give each other, but I can't help wondering if anyone outside the writers' groups actually reads the things or cares about them.
I am a bit old and I still struggle like buggery with Twitter, which always feels like shouting at passing traffic rather than actually interacting with anyone, but I don't want to miss out on useful promo, but nor do I want to put off potential readers by boring them with constant updates that basically consist of 'buy my book/buy my mate's book'.