You can edit title and description of your Flickr Photostream with this app. And you can post your photo to Twitter.
If you are using Eye-Fi, Wi-Fi router and Twitter, I recommend this one.
-Edit title and description of your Flickr photos
-Set privacy levels of your photos
-Post your photo's URL to Twitter(*)
(*)It is necessary to register Twitter account on "Your Account" of Flickr.