The first app (by release order) is called Second Friends and was developed by Art Fossett (I'm using the developer's SL names in both cases). The app lets you display your avatar name and picture and a list of your Facebook friends that are using Second Friends on your Facebook profile. To use the app you need to do two things: you need to add the app on Facebook, and you need to pick up a personal key at an in-world kiosk on Eduserv island (you can reset the app and get a new key anytime).
Second Life Link
The second app, Second Life Link, was developed by Fire Centaur and another developer. It enables you to display your Facebook using SL friends in a similar way to the Facebook's defalt friends' list.
in-world terminal in English Village.
(again, you can get another key anytime). A neat thing about Second Life Link is also the fact, that your Facebook friends get the option to register for a Second Life account on Facebook (in case they don't already have one) after adding the app. So you can also send invites for the app to Facebook friends that don't have a second life and trick them into getting one ;) After you've confirmed your identity, the app will automatically fill in your friends list with Facebook friends that are already using the app. Then you can also modify your Second Life Link profile by adding your avatar photo and one home and one favorite SL location you want to share with friends. Your SL friends will then be displayed on your profile with avatar photos and names, and if you click the See All link in the app on your profile or access the app from the left-hand menu, you can view whether your friends are online or offline in SL, and you can also teleport to their home or favorite location from Facebook.
Both apps are still in beta, and I'm sure both developers will welcome our feedback. Currently, I have both apps installed and appearing on my Facebook profile, because they both help me connect my Second and Facebook life in a bit different way. I'm certainly looking forward to new features of both apps; and who knows, maybe we'll soon be able to "throw a sheep at" or "poke" our friends in SL from Facebook (throwing sheep should look spectacular in SL! ;) ). But for now, I'm really excited about the fact that my SL friends can get a special place on my Facebook profile. So, if you're a Facebook and Second Life user and want to connect the two, I recommend you give both apps a try, and let me (and of course the developers) know what you like/don't like, and what features would best for future versions :)
Note: This is just an archive post. The blog has moved to a new home at blog.ialja.com, where you will also find a copy of the entire blog.