Actress Lakshmi Menon on Saturday clarified that she's not signed up for micro-blogging website Twitter. She also requested her fans and well-wishers to unfollow her fake profile."It has come to my knowledge that someone who claims to be me is on Twitter. It's a fake profile. I request my colleagues and fans to stop following and replying to the profile," Lakshmi said in a video message.Although present on Facebook, Lakshmi said she's not quite active.Known for working in films such as "Kumki" and "Jigarthanda", Lakshmi currently awaits the release of her Tamil zombie film "Miruthan".She also has Tamil film "Rekka" with Vijay Sethupathi in her kitty.