Step-by-step explanation:
1.)
If the only information that this company was able to get is the ISP then they should provide it to the court and then the court handles it by ordering that the ISP be registered. through the ISP, details of the poster would be ascertained and. this poster would be caught. The company can then decide to take legal actions because this a a degradation on the company and it is also a form of social harassment.
But in a situation where the complaints is unable to be proven because of insufficient facts, then a lawsuit cannot be filed.
2.)
craigslist cannot or shouldn't be subjected to any liability for FHA violations after all they are just a service provider and shouldn't be held responsible for the violations or unlawful practices of a another party. What craigslist engages in is the provision of platform for users to be able to post advertisements.