Facebook is planning to combine user data with that of recently acquired photo-sharing service Instagram, and loosen restrictions on emails between members of the social network.
Facebook also revealed plans to scrap a four-year old process that lets the social network's users vote on changes to its policies and terms of services.
Facebook said it may share information between its own service and other businesses or affiliates that Facebook owns to "help provide, understand, and improve our services and their own services."
One of Facebook's most significant affiliate businesses is Instagram, a photo-sharing service for smartphone users that Facebook acquired in October for roughly $715 million.
We found the voting mechanism resulted in a system that favours quantity of comments over quality.
The change could open the door for Facebook to build unified profiles of its users that include people's personal data from its social network and from Instagram, similar to recent moves by Google.
In January, Google said it would combine users' personal information from its various web services - such as search, email and the Google+ social network - to provide a more customised experience.
Google's unified data policy raised concerns among some data protection regulators, who said it was an invasion of people's privacy.
Facebook also wants to loosen restrictions on how members of the social network can contact other members using the Facebook email system.
Facebook said it wanted to eliminate a setting for users to control who can contact them. The company said it planned to replace the "Who can send you Facebook messages" setting with new filters for managing incoming messages.
Asked whether such a change could leave Facebook users exposed to a flood of unwanted, spam-like messages, Facebook spokesman Andrew Noyes said the company carefully monitors user interaction and feedback to find ways to enhance the experience.
"We are working on updates to Facebook Messages and have made this change in our Data Use Policy in order to allow for improvements to the product," Noyes said.
The changes are open to public comment for the next seven days. If the proposed changes generate more than 7,000 public comments, Facebook's current terms of service automatically trigger a vote by users to approve the changes.
But the vote is only binding if at least 30 percent of users take part, and two prior votes never reached that threshold.
Facebook has said in that past that it was rethinking the voting system and has since moved to eliminate the vote entirely, noting it is no longer suited to its current situation as a large publicly traded company.
"We found that the voting mechanism, which is triggered by a specific number of comments, actually resulted in a system that incentivised the quantity of comments over their quality," Elliot Schrage, Facebook's vice president of communications, public policy and marketing, said in a blog post.
Instead of the vote, Facebook will look for other forms of user feedback on changes, such as an "Ask the Chief Privacy Officer" question-and-answer forum on its website as well as live webcasts about privacy, safety and security.
Facebook, Google and other online companies have faced increasing scrutiny and enforcement from privacy regulators as consumers entrust ever-increasing amounts of information about their personal lives to Web services.
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