Dead-letter blog?
A dead-letter box or dead drop is “a physical location where communications, documents, or equipment is covertly placed for another person to collect with out direct contact between the parties.” (from Spy Abbreviations, Acronyms and Terminology)
How to use a dead-letter box. (from Google cache)
"I didn’t know I was this geeky until I discovered the online world through my office’s 2400 baud modem back in ’93."