When someone starts following you around on social media by friending the people that you are already friends with whom don't know about the disagreement with you and the other person. A good example of this is in the case of Donald
Trump TWEETING that Barack Obama had 'wiretapped' him during the election.
By "wiretapping" -
Trump was using an 'expression' that literally meant:
"he was into my business" or "he was reading my posts"
A good example would be if
Trump were friends with Sheryl
Crow on Facebook and then later Obama hits up Sheryl Crow with a friend request which she accepts and then
Trump makes a comment on Sheryl's feed like,
"Hey, I heard that Lance lost his testicle. I'm sorry to hear that. I guess that he wasn't covered under Obamacare..."
Which
Trump thinks is 'somewhat' of a 'private conversation' because Sheryl Crow's posts aren't usually public, but what he doesn't know is that Obama friended her once he found out that
Trump and Crow had been 'sharing statuses' and so Obama is categorically "wiretapping".
That's a 'basic' explanation of what
Trump meant when he said, "I just found out Obama was wiretapping me."