Stuck on Thing 3, and nobody's on the pull

OK, the rest of the Cam23 gang is diving enthusiastically into Thing 5 [worryingly, some are blogging about mysteries such as Thing 16 and the like...] and Miss Crail is still agonising over Thing 3.
Blogging is helpful for making contacts and forming communities, right? But part of the reason for this task is to get us to consider using it for our libraries, correct?
So here's a problem. Web 2.0 is moving us away from having to accept the information pushed at us to information we choose to pull in. Ergo blog followers are interested, so fine for that community-forming thing. However, one of our major functions is to reach out to those who aren't interested / don't know what we offer / don't know we can help /etc.
I've set up blogs for both the Genetics and Plant Scis Libraries [thank goodness for those multiple e-mail addresses as I couldn't use the same one, annoyingly] but I really haven't anything much to say, same as the Facebook pages. At this time of year, what might I say? To the Part IIs - could you rummage around in your rooms before you leave and make sure you haven't got any library books to return. I could say that, but who would see it? On the other hand, I could send out a message to the generic Part II e-mail address - and they would all get it! Targeted, and none of the other dept members would be complaining about spam. Or I could put a message on the home page of their Camtools site - or get Camtools to e-mail a message. Perfect, job done. In October I might need to tell the postgrads that they can always ask me stuff if they miss the resources talk. Targeted e-mail to all postgrads, fine. Poster, badge, t-shirt - quaint but probably works. Blog - er?
Even within this Cam23 community I am having problems with the blogging concept. Another example - I would like to connect with other Cam23ers around the Downing Site area and I happen to know a couple of them, but a connection via blogs is not necessarily the easiest way. However, were I to put out a message on LIB-LIST, I bet I'd get replies almost immediately.
So I guess I am thinking at the moment is that for a big library where lots might be happening, a blog could be fine, but, for small ones, followers might have graduated and given birth a couple of times before the next bit of news.
Correct me if I'm wrong. PLEASE correct me because I'm feeling old and unwillingly Luddite. That IS off the statute books as a capital offence by the way, isn't it?
And by the way, how to schedule a meeting on Doodle when Miss Crail is Billy No Mates? Ah, I know - e-mail. Oh STOP it