Shady. I only have a few third party Facebook apps, but don't really use any of them anyways.

SpeedDate, the online dating site that throws singles in a series of rapid dating sessions, has hijacked over 500,000 users from at least three Facebook applications. Users are logging on to Facebook to find that the applications they’ve had installed for months have been replaced with SpeedDate without being asked to opt-in.

....

The three affected applications are:

• Have You Ever??? (353,217 monthly active users)
• Would You Rather (158,291)
• Romantic Gifts (28,164)

 

http://www.techcrunch.com/2008/09/12/speeddate-hijacks-facebook-users-with-a-bait-and-switch/