I don't really object to other people's having content filters, and I see why they might be necessary for work-unsafe postings. But when people on my friends list ask about opt-in content filters, I always respond to them by saying "please put me on all filters you're comfortable having me on."
And I sometimes feel an uncomfortable obligation to search out the opt-in content filter postings of all the folks on my friends list or else risk missing something I would enjoy reading (and possibly give someone the wrong idea because I happen to miss a day or two of their journal and miss their content-filter poll). However, I'm aware that this is my problem, not anyone else's.