Throughout the trading day, the twitter account @most_valuable_20 will tweet updates about the 20 US biggest stocks by market cap. It will tweet the stock symbol, last price with time/date, a 1-day graph image for the stock, as well as a direct link to the Yahoo Finance page for the stock.
The data is pulled from Yahoo Finance and fed into Yahoo Pipes which requests the specific data for the stock. Yahoo Pipes then sends the data into an RSS feed which is fed through dlvr.it to be tweeted automatically.
example tweet: https://twitter.com/top_20_updates/status/569270902837239808