The lesson of this story (of a Catholic blog using commercially resold Grindr data to out a gay priest) is *either* that anonymised data can always be de-anonymised (pretty much the intuition of lots of experts I know), or, less generally, you can't expect an org that benefits from selling other people's data to calibrate how much they should spend on anonymising.
The other lesson of this is that hookup apps should be under the control of the community, not private interests.
Adding uniformly random noise is also a promising technique, but it intentionally limits the analysis which can be performed. Looks very promising for opensource app analytics to assert it's not doing anything fishy, but I haven't seen it fully used that way.
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