Best Jailbreak app for sharing photos saved on your iPhone with friends on Facebook and Twitter followers. The Apple iOS does not provide feature to share the photos except via email and MMS.
The Cydia app is called iSocialShare and after getting installed it will add a button called Cloud to the photos viewed by you. If you want to share any specific photo simply tap over the Cloud button to access the sharing options.
iSocialShare is available via BigBoss repo and costs only $1.99 to install.