Yes, this is my 5th name on MN. Another one who feels like I know loads about people here whereas they don't know me.
It's not so much being 'outed', but someone realising who you are and then knowing your opinion on everything from various babies' names, to whether or not children should be invited to weddings, to whether or not leggings are stylish or hideous, to the rights and wrongs of abortion and every minutiae in between. 
I just doesn't feel right people maybe realising who I am and then being privy to my inner most opinions.
I have recognised people on here, even after name changes, from other forums I've used in the past and am quite amazed at the level of detail they're prepared to divulge, right down to health problems, things that have happened to them, where they've live, their child/ren's names...
Again, it's not that I expect people will use info against me
just that they'll be able to know what I think about anything and everything.