Beware of malware on Facebook (and elsewhere on the net!); such as this one which purportedly comes from ones friend:
“I Used this New Best Photos App and thought you might like it!
91% of Facebook users like this new Best Photos App.
View your friends photos today by clicking here
March 12 at 2:52pm via Friends Photos · Like · · Click to View New Photos”
When you get what may be an App from a friend the best route to take, which I do, is confirm with the friend. The above cited “Photos App”, for instance, is actually a link to a dating (and probably porn) site. Malware like this one can harm longstanding, long distance friendships.