SparkBlocks [datacollective.org] is a web-based tool that generates small and concise sparkline representations from a row of numerical data. Its unique feature is that the resulting graphs can be copied and pasted in Twitter messages, finally making 140-character real-time social visualizations (#sparktweets?) possible for all.
Alternatively, one can download SparkBars! [datadrivenconsulting.com], which is an Excel workbook that achieves the same result.
Recent examples of sparkline-enhanced tweets include the Wall Street Journal communicating 12 months worth of unemployment data, the use of a sparkline as an elaborate line graph, some infographic exaggeration or humorist comparison.