Yes, and they could've just gone to her and done it.

When the FBI served me with a subpoena they were waiting in the tube when I walked out of a plane. I'm sure they'd be capable of going even further to serve someone with a NSL.

Well, good luck "just going to" her now that she's been tipped off.

Based on my read of her blog post there was nothing stopping the FBI from doing just that while she was in the US.

It'll definitely be very easy for them to do that if she ever wants to enter the US in the future.

Presumably the "matter of national security" has a time limit. That said, Applebaum and Snowden have seemingly managed to get comfortable enough without returning to their country of birth.

It's obvious that the FBI isn't trying to serve a NSL here. If that's what they wanted to do, they'd have done it.

What makes you so sure? Are you an expert in serving NSLs to people who have devoted their life to enabling secrecy? What are your credentials?

If your words speak for themselves, I suspect none more than "owner of keyboard." I'd be delighted to be shown otherwise.

I remain agnostic, if not healthily paranoid- which seems to me to be the general sentiment in the comments on this post.