[nickcarraway]

Has Mr. Schiavo asked any party for a retraction?

How many parties in the Unites States would he need to pursue?

The laws regarding this are much stricter in England, but even there it's not that easy.

[Poohbah]

Has Mr. Schiavo asked any party for a retraction?

IIRC, once he does that, he has a limited time period to act. A wise strategery would be to collect as much evidence as possible before striking.

How many parties in the Unites States would he need to pursue?

At first, he'd only have to pursue FR to divulge the names of the posters in question, then their ISPs.

From there? Who knows? Maybe it's only 20-30 people on FR, posting under multiple nics...

[Catspaw]

Has Mr. Schiavo asked any party for a retraction?

Hasn't as yet.

How many parties in the Unites States would he need to pursue?

One--if the other party is in another state. That's for a federal lawsuit.