Here is a detailed history of David Brotsky's (aka David Appletree, among a host of additional sock puppets) fake JIDF: http://www.israelandstuff.com/jidf-once-respected-now-a-platform-for-harassment-bullying-and-libel
This is a collection of his anti-Israel Tweets and comments that led to his Twitter account permanently closed, and his Facebook account banned: http://www.israelandstuff.com/an-expose-on-david-brotsky-the-creator-of-the-jewish-internet-defense-force