Did you get sucked into trying the "Most Used Words" app on Facebook?
Comparitech.com says you're not alone -- 16 million people did.
However, websites and users are reporting concerns about the app.
One user in Colorado said he woke up one morning a couple days later and suddenly had several new, foreign Facebook friends he did not add.
Wired Magazine is warning that the app is a privacy nightmare.
So what can you do?
First, before you download or use any app, look at what information it wants. Does it really need your friend list? Your birthday? Your employer? Access to post on your Facebook account?
If it's too late for that and you already have the app on Facebook:
If you're on Facebook mobile: