When you find someone on the Internet, most likely on Omegle or Chatroulette or possibly an online forum, who appears to be so tailor-made for you that you develop a crush on them.
An Omegle-based dramatization:
You: Female here
Stranger: Male
You: Cake and grief counseling will be provided at the end of the testing period.
Stranger: The cake is a lie.
You: ZOMG! Netcrush! Add me on Facebook. <3