I'm with TNG largely here. I'm a pretty well seasoned veteran of the internet and the occasional repost doesn't bother me. As mentioned above too, most of those posts are simply 'How about that weather eh?' in nature, which isn't harmful in my opinion. Linking to the original post I think provides a continuity that you'd be hard pressed to find elsewhere, and it provides a non-threatening, non-offensive reminder that maybe your topic has been discussed here before.
Hey ecib, _refugee_ and Ben: Don't knock the weather question. I asked the weather question recently here and got 144 responses and almost none of them about the weather. (Eddie and Ben - I know you're not knocking the question). But I want to add something here: There have also been several posts regarding being PRESENT, experiencing your life in the NOW -- Unlike Australia, it's damn cold here right now so we burrow, nest, and hibernate (hubskinate?) indoors a little more.
I can't help but wonder, with all the emphasis on immediate existence, if the population of Hubski, by some weird coincidence is just a little bit Buddhist. The idea of being in the NOW is a very Buddhist concept, and it's actually taught as the first step towards proper meditation.
AlderaanDuran meditates from what I understand. I wonder who else.
But why ask a question that's not going to get relevant answers? I mean, if none of them were about the weather, then why ask about the weather in the first place? Why not ask about something else? If the question elicits off-topic answers it doesn't matter what the question really was. And besides, the title of your post - that thing that makes people click into the discussion - wasn't about the weather, it was a general "tell me something" sort of thing. The weather was more of a suggestion that was then disregarded.
I'm all about meeting people via weather. I like to think I'm a little more adept at casual conversation and ice-breaking than having to resort to it, but I fully endorse it. Come to think of it, it would be fun to try the inverse. For a period of time, in social settings, initiate all new connections strictly via conversations about the weather...