[JulienSchmidt]

Likely she searched for the name "porter" at some point suggesting that she is interested in people with that name.

Combined with 2nd and 3rd degree phone and email connections that might be a strong indicator for FBs algorithm.

[takeda]

Yep, the article totally ignores it. The fact that she immediately said that they are related, makes me believe she was looking at his profile earlier, and FB just picked up on it.