There are some fake Lucy Lawless Facebook pages proclaiming themselves as being official. I could write an encyclopedia about imposters. But instead I'll direct you to a couple other previous posts I wrote on my other blogs. They involved fake Lucy sites too. Recently from December 4 2011 - Lucy Doesn't Have a Facebook. And from October 25 2010 - Celebrity Impostors.
Lucy doesn't have a Twitter either. She has an Official website though: http://www.lucylawlessfanclub.com/ If she were ever to sign up for a Twitter or Facebook or anything else, I'm sure it would be announced and linked from there. Also you can also follow @sharondel at Twitter. She's the webmaster for Lucy's site.