In fairness, privacy issues have been a bit like a "frog in boiling water". Unless you pay a lot of attention to these things or are completely out of the loop, the average person won't see the issue.
At least my grandmother's vindicated now for not wanting to get on Facebook and share those sorts of things
It usually does, however, there are cases where a hole can have two openings. For example, there's a saying/idiom about digging a hole through the earth and ending up in china/australia/etc. It would be confusing to say that you "dug two holes" to China, you would only say that you "dug a hole" to China. "Tunnel" is definitely more precise here, though it would be odd to refer to the openings in a drinking straw as a "tunnel"