If I'd like to let someone know they can reach me via [email protected], as well as via Twitter and Facebook, what's the most correct way of writing?

> - Feel free to hit me up via [email protected], as well as via Twitter and Facebook.
- Feel free to hit me up at [email protected], as well as at Twitter and Facebook.
- Feel free to hit me up on [email protected], as well as on Twitter and Facebook

Or simply none/a combination of the above? Thank you very much.