The 600 million numbers that Truecaller has in its directory have been collected via crowd-sourcing. Truecaller’s users can share their contacts and in return they get access to search in the collaborative database. Thanks to this collaborative data solution, the directory is growing and being updated continuously. It also contains numbers that no other directories have, e.g. pre-paid phones.
ProgrammableWeb has been tracking Twitter mashups since the first one was added in December, 2006. Looking at the number developers have added to the database, one thing is clear: 2009 was a huge year for Twitter and apps built upon it.
Foursquare has embraced the open maps movement. Russia's biggest search engine integrates with the Topsy API. Plus: Disqus comments available in Gnip, Microsoft launches its own Webmaster Tools API and 21 new APIs.