Re: Can i increase the memory on an ipad
That's not possible. However, you can put your media like music, videos and photos in the cloud. Dropbox, Google Drive, OneDrive and/or Box are good examples.
I, personally, have all my photos on Dropbox, all music in Google Drive and Videos on OneDrive. Whenever I need them, I just use their respective apps.
And from time to time I delete and reinstall Facebook, Twitter and other apps without the 'Clear Cache' functionality, to do so manually.
True, 16GB is not a lot, but is well manageable