Facebook said Friday it mistakenly removed a post in which Arizona Gov. Jan Brewer criticized a controversial policy decision by President Barack Obama's administration to limit deportations of illegal immigrants.

The Republican governor had said in a post Friday that Facebook censored the item she posted Thursday because it apparently violated Facebook's community standards.

Brewer didn't elaborate in her post, but she said Friday in an interview that an email she received from Facebook said the post was removed because of an included illustration.

The email, which she read aloud, didn't specify how the illustration violated standards.

"I'd like to know why it happens,'' she said of the removal.

Facebook spokesman Andrew Noyes responded to a query by The Associated Press by saying in a brief email that Brewer's post was removed in error and that Facebook was sorry.

U.S. law-enforcement agencies are increasingly obtaining warrants to search Facebook, often gaining detailed access to users' accounts without their knowledge.

A Reuters review of the Westlaw legal database shows that since 2008, federal judges have authorized at least two dozen warrants to search individuals' Facebook accounts. Many of the warrants requested a laundry list of personal data such as messages, status updates, links to videos and photographs, calendars of future and past events, "Wall postings" and "rejected Friend requests."

Federal agencies seeking the warrants include the FBI, DEA and ICE, and the investigations range from arson to rape to terrorism.

Facebook has plans for an "awesome" unveiling Wednesday, according to CEO Mark Zuckerberg, who is expected to announce a partnership with Skype, the Internet video calling company.

Facebook is not saying exactly what is in store, but sources close to the companies say a Skype partnership is inevitable. The union would bring video-chat capabilities through Facebook, allowing multiple friends to talk at the same time.

Video chatting is one of the few social networking features lacking in Facebook, an omission that has become even more glaring since Google launched an application called Hangouts.

Last week, the search giant unveiled Google+, a Facebook clone designed to play catch up in the social network space. Hangouts, a feature within Google+, has received some positive feedback for making video calls easy.

Doctors say what may seem fun and innocent may actually be leading teens into what's being termed "Facebook Depression."

If you're a teenager you're most likely on a social networking site like "Facebook." For most it's a fun, easy way to keep in touch and find out what's going on with friends. But new research shows a growing number of youngsters who obsess over the on-line sites may be headed down a troubled path.

The American Academy of Pediatrics warns of a new problem called "Facebook Depression." It results from being bombarded with friend tallies, status updates, and photos of people happy, having the time of their lives, when you are not.

Facebook’s managers are deploying a new software upgrade that will dismantle myriad groups of like-minded political activists unless they get a special software-key from the company.

But Facebook managers are providing very limited information about which groups are being favored with the new key, prompting some activists to complain about possible political favoritism among Facebook managers, and many other activists to experiment with techniques and tricks to get the needed upgrade-key.

“Who is being given the upgrade?” asked Pamela Geller, the New York organizer of a 15,000-member group opposed to Islamist political groups. Without the special key, groups lose access to their members, she said. “I’ve seen people really freaking out.”

Facebook CEO Mark Zuckerberg is planning to make his second visit to China as the world's No. 1 social networking company looks for the best way to expand into that country.

"Our company mission is really clear, which is we want to connect the whole world," said Facebook Chief Operating Officer Sheryl Sandberg at the Reuters Global Technology Summit on Thursday. "And it's impossible to think about connecting the whole world right now without also connecting China."

Sandberg also described a public offering of Facebook shares as "inevitable," though she declined to provide details on when Facebook expects to have an IPO.

"It's a process that all companies go through. It's an inevitable process for us, the next thing that happens," she said. "People used to ask us if we were going to get sold. People have stopped asking that question -- we're not ... No one is buying us, we're going public."

With the release of their API's, sites like Digg, Facebook, Flickr, and YouTube are taking the web by storm. Here's a look at their plans for web domination.