I plan on posting ads on Craigslist using this person's number.
Why would you post someone else's number on a craigslist ad?
I'm going to see who's going to call him
Posting someone else's phone number online without their knowledge is immoral. It is wrong to cause someone unnecessary stress, not to mention you are putting their privacy at risk.
Hey, I'm bored and I don't have anything else to do.
I get to your board, but there are many other things you could do to satisfy your boredom. Posting someone else's private information online is unethical and could land you in legal trouble.