By Alexei Oreskovic SAN FRANCISCO (Reuters) – Facebook introduced new features on Wednesday that let users limit how much personal information they share with third-party mobile apps, a move meant to quell privacy concerns as the social network seeks to become a top entry port to the Internet. In recent years, Facebook Inc has successfully encouraged a growing number of third-party app makers to allow users to log in with their Facebook identity rather than, say, by entering an email address or creating a dedicated account. The result has been an influx of valuable data for the worlds No. 1 social network, but concerns have also mounted about third-party developers gaining access to private information. Chief Executive Mark Zuckerberg said at Facebooks developer conference in San Francisco on Wednesday that a new version of Facebooks log-in tool, called log in anonymously, would let users control what information they allow third-party apps to see.