Work colleagues can be the worst offenders!! I had an experience with a colleague once - not ttc related. I love to travel, and am on a bunch of Facebook groups to discuss future plans and places I want to go. So eventually I quit my job to travel (in august) and one of my colleague comes up to me all sneaky and says "I knew you were going to leave" and proceeds to show me all the screenshots she's been keeping of my (I though was private) Facebook activity... From January! OMG I almost choked her in my rage!

Best of all, she was secretary to the CEO, so she had been breifing him about my 'plans' to leave all along (even though the trip was prompted by my husbands work circumstances, not mine).