You can find my contact information here.
You can send me email via the link button in this page, or contact me on Twitter.
Please send email to my personal gmail address whatever subject do you want to write, since Fermilab has recently made it unacceptably difficult to check their official email system.
Contacting me via instant chat app is also possible (and actually preferred after we get familiar with each other), but a first contact via the above methods is needed. After that, you can reach me out on skype for academic chatting and on Telegram for all the other stuffs. WeChat will not be available unless you are currently located at Chinese mainland.
Facebook may also be used for some irregular contacts, but I don’t put many moments there.