So, according to these allegations, #Facebook:
1. Lost lots of ad money when people abandoned computers for phones.
2. Panicked.
3. Got smaller companies hooked on access to FB users' private data (not ads but personal data).
4. Once the companies were hooked, FB forced those companies to buy expensive FB mobile ads. Companies that didn't comply had their access to user data switched off.
In short, they allege FB was using our data to control these companies.