See, e.g.,
LeBlanc v. Skinner,
Seldon v. Compass Restaurant,
Chaker v. Mateo,
Sandals v. Google,
DiMeo v. Max and
Finkel v. Dauber,
Bellavia Blatt & Crossett, P.C. v. Kel & Partners LLC, John VOGEL et al., Plaintiffs and Respondents v. Joseph FELICE, Defendant and Appellant
Also, companies like Reddit, Topix and so forth have been forced to change/update their policies regarding conent posted because of previous and pending legal litigation.
You aren't as anonymous as you think on the internet. This site has your IP address and is in constant communication with it. It also codes everything you type and post and associates with the account for which the IP is associated with. Your ISP will keep detailed data records for years that detail everything you did online. If a lawsuit is placed all they have to do is request those records and your identity is easily known. In the event you share a computer or IP, they will check time stamps and records to narrow down who was active at the time.
I can lead you to the water, I can't make you drink it.
Can you link. I have not seen it. And again, that is just 1. What about all the others?