These days, everyone is on the Internet. From experts to celebrities to scientists to authors, everyone has social media accounts. What that means, though, is that anyone can see anything people post about them. People are free to criticize and express their opinions, but people also have to be careful and know who they are talking to, or things might get embarrassing.

Many times, people will say something to someone without realizing they are an expert on the topic or that they are the very person they are talking about. It's both a hilarious and cringeworthy thing to witness. Normally, it would be rude and pretentious for someone to ask, "Don't you know who I am?" but in these cases, it is truly warranted.

Here are 25 embarrassing moments from Reddit's /r/dontyouknowwhoiam of people not realizing the person they are talking about online is the person they are talking to.