My opinions on facebook for libraries are already out there in the ether - see UKOLN Guest blog - though 'Tilley' has been translated as 'Taylor'; nicer but less memorable and less findable perhaps??
I have read Jane Secker's article before as her work at LSE in general interests me. I was struck by the phrase in the article 'unfamiliarity with Facebook' as an issue with not engaging with the tool as a use for teaching and learning. Thinks that this is really the problem with any of the tools we're looking at. The more you do play with them, the more applications seem to be there. But also been thinking about time again, as this all does take time and there is a very real need for an ability to be able to scan something and make fairly quick judgements on whether this is might be useful or not and then to discard swiftly if you think it is not. As several of us discussed yesterday it is indeed all about time management.
Suffice it to say our Library has a Facebook site - we use it for fairly casual information - nothing so important that we need all our users to see it, but casual enough to attract a wide variety of people on to the site - from observers, to alumni, to prospective students, to current students and staff. It's fine by us. BUT this is really why we have an information delivery policy (see UKOLN blog).