Changetip is a Bitcoin-Based Social Payment Service for Twitter. Within a few weeks of service, already 20.000 Euros were tipped via Twitter.
You can tip with literal amounts,like $1 or 1 USD. You can see the list of supported currencies here.
You can also use standard monikers. Monikers are like tags. They are just words that represent an amount of money. For example: 1 beer, 2 coffees, or 5 donuts. It’s really fun to create your own monikers.
You can even assign a value to phrases, like “thank you”, “cool story, bro!” or “This is awesome.” Monikers make your online tipping experience fun.
ChangeTip Analysis of Tips on Twitter from IHB