From Atlas Obscura: How Anti-Plagiarism Software Led Scholars to a New Shakespeare Source Text. Shakespeare apparently cribbed a few passages from the work of one George North.
Classifying Conversation in Digital Communication eschews content analysis of social network threads and looks instead at who participated in the conversation and when. This approach can possibly reveal patterns of behavior.
Wearing my tinfoil hat, I will have to say this is another reason not to participate in social networks at all!