Given the news that Cambridge Analytica scrapped the data of more than 50 million people on Facebook by using a personality testing app it might be a good time to look at who you've let access your data on Facebook and cull that list down to the bare essentials. It's worth noting that the data was originally gathered with consent, though how it was used and by who is a much muddier issue. It's also worth mentioning that this isn't the only shady thing Cambridge Analytica is in the news for.
You can see all the apps you've allowed access to under your settings. I had more than 30 and I've managed to cut that down significantly.