I have made a so-called ShareKit beta, it has many fixes for warnings and also features a new SMS share component. This should dramatically be faster on all iOS's. Feel free to download it and of course add a comment if you would like to see a new feature added!
Thanks!
ChangeLog:
1.0: Fixed most warnings, made some improvements. Also fixed some leaks
1.1: Added SMS capabilities, fixed all warnings and leaks. And made other misc. fixes
1.2 Coming Soon: Will feature the latest FBConnect so it works better on all iOSes. Look at the FBConnect change log to view their fixes in the latest version:
Also keep in mind that iOS 5 Beta will encounter some problems but it is the iOS's fault. It should be 100% when the GM build comes out
Download Links
Version 1.1 Site 1 (Never Expires): http://www.mediafire.com/?pbuuf1j6cub3gj9
Version 1.1 Site 2 (Never Expres): http://www.2shared.com/file/g33bKZ64/Beta-ShareKit_2.html
Also I give a very special thanks to: Sebastien Thuilliez for helping with some of the fixes and bugs!
As you didn't provided any sample source project, but only the library, I used this library on a project that is already using the ShareKit v0.2.1 (lib. which hasn't moved since a while).
Then I successfully logon to Facebook and send content using the SHKFacebook shareItem method, using your implementation. Both login & share content dialogs were displayed correctly.
Note that I had no warnings with FBConnect ( I always treat warnings as errors ).
For information :
Please let me know, if you need to do an extra particular test, because regarding the Facebook Sharer it seems to be fine.