Family drama AITAH?

So my friends MIL and her sister have been dragging her family in the mud for 5 months on public forums. They blocked her and the family and started making stuff up on fb and TT about them. Shes tried everything next to suing them but nothing can be done about it bc its all on online. So its a civil matter. So i found out she had a snark page on here and i told my friend. She joined it. Started talking to the people who had been following her MIL and noticing her indescepencies and lies. She has been confirming on there what is and isnt true all the while they are strait up lying through there teeth and complaining that her and her husband not just joined a hate page but are saying that the created the page. A lot of people agree with her choice but many is sayimg shes feeding into it. Is ignoring the situation really whats best? Is my friend the a hole for going on reddit?