Facebook has been a widely-used social media app since its public launch in 2006. It was the first of many apps to connect people from all around the world in one place: the internet. Even today, Facebook remains the most popular social media site, just above Facebook-owned Instagram.

However, recently the app has been getting some buzz from the press, and not the good kind. While the app promises security and privacy of personal-user content, the recent Cambridge Analytica scandal — in which, according to Facebook, up to 87 million users’ private content was improperly obtained and used by the Analytica data firm, owned by right-wing donor Robert Mercer, to sway voter opinion through political ads — has made a mess for the social media giant. This has pushed Facebook and CEO Mark Zuckerberg into their biggest crisis yet, and it’s all being closely followed by the angry eyes of the public.

According a 2015 article in the “The Guardian” — the British news and media site that first uncovered the scandal — this selling of private information to political campaigns came to light when they uncovered United States Sen. Ted Cruz — a republican presidential candidate at the time — was buying Facebook user content from Cambridge Analytica without permission from users. All this was part of a new, aggressive voter-targeting campaign by Analytica that meant to create and use “‘psychographic profiles’ of U.S. citizens in order to help win Cruz votes, despite earlier concerns and red flags…”

Every time a user “liked” a certain post — which Facebook stores in their database — or posted something to their timeline, viewed their newsfeed, even sent a private message, it was obtained by Cambridge Analytica. They then used this information to uncover the user’s political opinion, location and age to  target specific ads to their Facebook page that would sway someone to a particular political viewpoint or event.

However, Cambridge Analytica is not the first to use this user content for specific ads. In fact, Facebook has been doing so for years — it’s why, after you like a post about a certain product, most of the ads that pop up are based on that product.

So why is it so wrong that Cambridge Analytica did the same thing?

It comes down to an invasion of privacy. When users sign up for Facebook, it is in the terms of agreement that Facebook can direct specified ads toward you based on your profile. Data firms are not allowed to illegally datamine user content to influence political stances and elections.

Since the scandal broke, Zuckerberg has faced trial in just the past week on Capitol Hill to determine Facebook’s future. While the outcome is fuzzy, Zuckerberg has admitted mistake in handling Facebook user privacy.

“Knowing what we know now, we would have done lots of things differently,” Zuckerberg said during his trial.

One thing is clear: after this scandal, it’s going to take a lot for Facebook to recover the trust of the public, and it won’t be easy. Until either a new scandal or new regulations for companies like Facebook are announced, be aware of your privacy terms and stay responsible on social media.