I know that you can post from a link but what about uploading the picture itself from the iPad anyone?
I don't know if this is what you are asking, but you can upload pictures from the iPad to Photobucket. That is the only photo sharing app I have (but I do use other photo sharing sites).
When you find a picture on your iPad that you want to upload, simply hold your finger (any finger!) on the picture for a few seconds and a box will pop up prompting you to either save the image or copy it. If you select the option to save the image, it will create an album (unless it already exists) called
Saved Photos. Now when you open your Photos (the icon with a flower on it), you will see this album.
Now open the Photobucket app and select
My Albums. At the top of the screen you will see and up arrow which is the upload option. This option allows you to either
Choose upload source (and I am not quite sure what this is because I have never used it and quite honestly, have not looked it up in the help files) or
Photo Library which are the photos stored on your iPad. When you select this option, you will see a list of all your photo albums and from here, you can select the
Saved Photos album and select the photo and voila, it is uploaded to Photobucket for you to distribute as you please!
Easy, huh?