I'm thinking that disproving notable but bad life-hacks would be interesting ground for our site to cover.
There are some "life-hacks" that seem to get repeated all over the internet even though they don't really work and disproving these may serve to "make the internet a better place..."
I suppose that the bar would need to be fairly high to keep the noise down, but a format similar to the one used on Skeptics may work.
Migrated from comments:
I think simply providing a few references/links to establish that it is a "well known" life-hack and explaining how you tried it and why you don't think it works would be a baseline for a question.
Answers would probably need a little more supporting evidence, for or against, and perhaps a little explanation of the science involved.