http://nymag.com/daily/intelligencer/2017/10/twitter-bans-bl...
I believe that particular decision was probably somewhat about disagreeing with her politics, but moreso about stopping outright lies ("fake news") from propagating on their platform when they could stop it.
Scandalous? Yes. Libelous? The NY Times described the practice:
> Companies that obtain [fetal] tissue from clinics and sell it to laboratories exist in a gray zone, legally. Federal law says they cannot profit from the tissue itself, but the law does not specify how much they can charge for processing and shipping.
> ...
> Many [labs] buy the tissue from companies that act as middlemen. Those companies pay small fees, usually $100 or less a specimen, to abortion providers like Planned Parenthood, who say they charge only what they need to cover their expenses. The companies then process the tissue and sell it to researchers for higher prices that reflect the processing.
> The fees, which can run to thousands of dollars for a tiny vial of cells, do not break the law, according to Arthur Caplan, the director of the division of medical ethics at NYU Langone Medical Center.
> “It appears to be legal, no matter how much you charge,” Dr. Caplan said, adding that there appears to be little or no oversight of the processing fees. “It’s a very gray and musty area as to what you can charge.”
https://www.nytimes.com/2015/07/28/health/fetal-tissue-from-...