Hello every body,
Greetings! i have just downloaded an application named as facebook, its screenshots were fabulous so i could not stop downloading it. NOW when i try to login to it with my user name and password, the time i hit login, a message appear Invalid API Key.
The Facebook side has proabably changed their API, or the app is not using it properly and doesn't always work, or Facebook has deliberately blocked that app. Ask the app developer of the app for explanations.