I’m not sure what my last company (I work as a temp) used, but it let me access Millennial Star and Times & Seasons without difficulty. It even let me access Blogspot blogs, which I found surprising. But it blocked almost all the other blogging platforms as “personal/hobby”, if I recall correctly.
What I like is that though it was obvious the company was using a service, it also let you petition to have something re-opened. Most other places I’ve worked at had no mechanism for communicating that a site had mis-categorized or ought to be whitelisted.