Facebook Messenger/Chat has a feature which allows a user to hold down a "thumbs up" icon, where the icon grows as it is held down. Once it reaches a certain size, it automatically resets itself. This includes a sound effect and shaking effect. I have re-created this functionality to work in OSSN, both via the messages page and via the chat windows. It's hard to tell from this animated gif demo, but the sounds and shaking effect have been incorporated as well. If you're interested in adding this feature to your site, you can send me an email (in my profile).
Here's an animated gif demo which shows the feature working first from the messages page, and then via a chat window.