I am a model and popular public figure currently living in Marbella, Spain. I have 5,000 friends on Facebook and when I do something on there everyone usually believes me.
See my profile: facebook.com/jemmajones.net
For this I will play a practical joke that you select on someone that you choose.
I have other options related to this whereby for example I will actually arrange to meet them etc. but for the first part you would need to have me play a practical joke :)