Facebook can be sued by people who see ads that show that their “friends” like certain brands. This is based on a California law that regards commercial endorsements according to U.S. District Judge Lucy Koh. Koh refused to dismiss a related lawsuit on December 16th that ruled plaintiffs may pursue claims that the company’s sponsored ads violate state law and are fraudulent.

Apple Inc. (NASDAQ:AAPL) supplier Pegatron has reported an explosion that happened in Shanghai over this past weekend. About 61 workers have been injured as a result. Pegatron CFO Charles Lin said that the explosion at the plant belongs to Riteng Computer Accessory Co at the Shanghai Songjiang industrial park. The building did not catch on fire, but 23 of the injured workers had to go to the hospital. Apple is investigating what happened. [Reuters]

Facebook has announced a new feature that allows business pages to receive private messages from fans on the social network. So far Asia-based Facebook Page admins have seen this feature so far. This could open up a greater level of personal communications between brands and their customers. [TNW]

AT&T Inc. (NYSE:T) has added free WiFi to four New York City parks. AT&T has announced that they are adding free WiFi service to Mineral Springs and Tavern on the Green in Central Park, Pier 6 in Brooklyn Bridge Park, and Devoe Park in the Bronx. Below is a press release about the news:

Microblogging service Twitter Inc. has raised $300 million from Saudi Prince Alwaleed bin Talal. Alwaleed is the richest Arab businessman and he considers the investment as a “strategic stake.” Alwaleed is the largest individual invest in Citigroup Inc. He is also a major investor in General Motors and Apple Inc. Twitter is in the process of revamping their user interface for their 100 million daily active users. Twitter is expecting to boost their ad revenue by about 86% next year.

Amazon.com, Inc. (NASDAQ:AMZN) shoppers have been buying over 1 million Kindle devices per week for about three weeks in a row. The Amazon.com Kindle Fire is the company’s best selling item as of right now. Even though the Kindle Fire has receive a lot of criticism for not having external volume and for being too balky, the company is working on updating their software. [Mashable]

Bradley Horowitz, the VP of Product at Google+ wrote on the company blog that they have created several new features to the social network. The new features include the ability to fine-tune your stream using a slider, a “sneak preview” notification system, and improvements to Pages.

SavingStar is a service where you can receive grocery discounts by entering your loyalty cards into the system. I just registered an account with them and I noticed that they are able to get me an additional $2.00 off from 2 boxes of Pepsi, $1.00 off a bag of Tostitos, 50 cents off Pepperidge Farm Goldfish, etc. from Kroger. Other stores that work with the service include Rite Aid, CVS, Piggly Wiggly, Albertsons, County Market, Food City, Lowes Foods, Jack’s SuperValu, Ralphs, and the list goes on. SavingStar launched in beta this past August and raised $2.3 million in funding from Flybridge Capital Partners, First Round Capital, Founder Collective, and several angel investors.