What’s The Fastest Media Channel To Get In Touch With Someone?

I want to conduct an experiment someday soon to discover the fastest media channel to get in touch with me.

The experiment:

Multiple people somehow find a way to get in touch with me (all at the same time) about going to dinner.

That sounds easy enough right? I am just curious to see which media channel I would check first and which media channel would people choose to find me. Would it be Facebook, Twitter, email, text, instant message, or phone call? I honestly want to know which one I would respond to on the fastest and check first. I know the phone would be out because I screen and don’t always like to talk to people (even my friends) when I don’t know why they are calling. I think either through social networks, email or text would I be most likely to respond, check first is a whole different question.

Which one do you think you would check first and respond to?