Simitator.com
This is the cool site with which you can easily create Fake Facebook chats and then take their screenshots crop them and then send then to friends to play a prank with them. Follow the steps for creating Fake Facebook conversation in the app.
Step 1. First of all, upload the profile picture of the first person and then give its name there.
Step 2. Now on the second step, upload the picture for the second person and then type its name too.
Step 3. Now enter the date and that it type the message to have Fake conversation with you.