In reply to gravy:
> The irony being that the people that many want to keep their data from still have access (ie facebook).
No - the irony being someone moaning about not being able to access content because the person who posted it has limited the audience to a certain list, a list THEY don't want to be part of because they choose not to use that service.
If you don't want to use certain data-harvesting sites like Facebook then you don't have to (although your friends and phone contacts will still happily give up your data for you). Just don't moan that other people are sharing content from it - there is no onus on a UKC poster to ONLY share content that is 100% publicly viewable.
As the last few years of very public scandals about metadata harvesting and resale have shown - most people don't care that much about handing over their data to huge corporations. They quite happily share their location, phone microphone and their browsing history with a few monstrous organisations so long as those organisations provide them with a service they want.