Facebook or Google searching their own data isn&#x27;t a search under the 4th amendment. All that data analysis they run on you is their data not yours.<p>Them searching your private messages&#x2F;emails are (probably) a search but since they aren&#x27;t government the 4th amendment doesn&#x27;t apply. If government specifically coordinates that brings it under the 4th amendment.<p>But--here is the problem. Google (and I assume facebook) are already reading your email. They run algorithms and text searches on it. If I were DOJ I&#x27;d argue 1) that none of those messages are private since the companies are allowed to read the data whenever they want. 2) if not, then the indexing and analysis is definitely not private.<p>People should step back and realize this CISA only occurs when you already let companies violate your privacy.