There appears to be a growing number of users being duped into thinking that the application they're joining or signing into is tied into games/applications that he/she uses on the popular social networking site,
Facebook.
One example is based on the popular Facebook application,
Farmville (by
Zynga).
The premise of the game, given a plot of land, you grow crops, grow fruit-bearing trees and raise farm animals and their off-springs. Like many of the applications on Facebook, players are welcome to send out gifts to other friends to elicit help or to get them join and add the application.
It's this feature that the scammers and info gathers are gambling on to get unsuspecting players to click, join and, in the end, have him/her post links on his/her news feed to try and get their friends in participating.

In the image above, you can see the icon that this fake application is using is the same as the actual application, not to mention the wording. There are some slight differences like instead of "Farmville", there's "
Farmville v". If you move your mouse over the "Find a collectible" link, you will see that it's pointing to
http://www.facebook.com/pages/FV-Filter/116000185105701?ref=nf
and not to the real application.
Here's another variation based on the game Farmville:

Again, the fake application is using the same icon as the real Farmville but posting time with the application name is slightly different, "
via via Farmville" instead of just "via Farmville". The link "Adopt the Percheron Foal" actually points to:
http://www.facebook.com/pages/FreeFarmGiftscom/332104581865?ref=nf
Many of these applications are designed to collect as much information about the users and because it's on a social networking website, collect information about your friends and their friends. It's also possible that the creator of the fake application might be delivering an unknown payload (e.g. malware) onto your system.
The best way to avoid it is to look closing at the application before you click on it, make sure that the URL links to the actual application and if you come across a fake application like posting, click on 'Hide' near the top right corner of the entry itself. This way, you won't see it again (until the next variation).