To maintain an online relationship with someone who doesn't exist. Whether you were knowledgeable to their existence remains a mystery. Similar to being catfished.
John: So, I went down to Florida and stopped by the address Claire gave me. The homeowner says that person doesn't live there. She also deleted her facebook,twitter,instagram and disconnected her phone. It's like, she never existed.
Bob: Son, you've been Te'O'd.