Marco Arment on his Safari Content Blocker:

I was therefore faced with a decision about The Deck. I had to either:

• Omit The Deck from Ghostery’s database, carving out an exception for the advertiser used by me and many of my friends.
• Enforce Ghostery’s database consistently, potentially angering my own site’s advertiser and my friends who use it.

And once I looked at it like that, it wasn’t a difficult decision. It’s uncomfortable, but I’d rather be consistent and fair.

He made the right decision. Oh, and FYI, if you are using a content blocker to block custom fonts — go for it, but this site will look like shit. I’ve never once tried to optimize it to be useable with fallback fonts. Sorry.