There's nothing rude about asking, but I think you should try to track down the source on your own first. You want to know that info, and unless the other person has that info already at hand, you are asking them to do your searching for you.
I disagree. But then, I think it's rude to post information/opinion *without* citing the source - and a discourtesy to the originator of the piece.
Also, as noted previously, I might look up a piece on Google (my video aversion notwithstanding) but find a piece which covered the point from the opposite angle to that which the intermediate poster intended/referenced.
FB isn't an academic paper. I don't understand why anyone would feel a need to cite sources in such an informal forum, especially when it is personal opinion. If there is a source to cite, then typically people I know link to it.
You are assuming that there is always something to refer back to. That's not always the case nor should it have to be.
I agree that FB isn't an academic paper. But I don't think I'm "asking someone to do my work for me" if I ask them where they got the info I'm interested in.
It'll be FASTER--even if they say, "it was a Washington Post story from last week" and don't have any extra info.
And if they don't want to do the work of remembering, then they can SAY that.
If I want you to believe what I've said, then I shoudln't be complaining if you ask for further info about it. If it's a hardship to provide that info, then I should speak up.
I wouldn't be doing *your* homework for you; I'd be doing *my own* work of providing the source of my info and protecting my own credibility.