If you'd like me to speak at your conference, ping me on Twitter and tell me about it.
I'm not interested. No, you haven't got a great opportunity for me. Please don't waste my time.
Please use the relevant project's issue tracker.
You can also ping me on Twitter, but if you use it for bug reports, they will get lost.
Friends know how to reach me.
"But I'd really like to get to know you!"
Don't be a creep.