Make sure the Like/Tweet buttons work

[danvk]

Currently they don't—hitting "Like" pops up a dialog under the "Popular Photos" panel and going off the right edge of the screen.

• [x] Like home screen
• [x] Share home screen
• [x] Tweet home screen
• [x] Like image details
• [x] Share image details
• [x] Tweet image details
• [x] Comment widget

[danvk]

A few issues:

• Tweet on image details is missing cross-street information.
• Facebook Like flies out off the page.