All the social networking sites including Facebook and Twitter has many images on it. Some are thumbnail images while few are bit larger ones. Many of them needs to be clicked to enlarge them. While sometimes images do not load when we click on them to enlarge. This usually happens with me when I use Facebook. This is sometimes bit frustrating.
There is an free app called ChatZum which enables us to see the enlarged view of the image simply by hovering over it. Download the app and install it just like any other simple program. It gets integrated with almost all the browsers.
Once the app is installed, launch the browser again and you should see the chatZum symbol. In Facebook you should see the symbol just next to the chat box whereas in Twitter it appears at top right corner of your webpage.
See this screencast for details:
