I can see no point of taking images if the photographer doesn't want to show some of them to the world.
There are many different worlds co-existing, the online world is only one of them and LL is a tiny sub-set, Facebook in another sub-set with some level of privacy control,...
Although I do share many images online, there are probably as many I do only share with a private audience (family, friends, people I shot for,...), either online or through prints.
The reason being that those images are of private nature and that either I or the subject depicted doesn't want that to be shared in the open.
Cheers,
Bernard