It is the nightmare of the wired world -- a smartphone low on battery.

But Swedish group myFC says their water-powered charger could be the fix even in deepest Amazon, while battery giant Duracell is championing a push for cars and even stadiums to be built with energy "mats" that would power up phones.

Over 100 leading global and regional ICT professionals are set to take the stage at the ArabNet Digital Summit 2012 to share their expertise on the latest trends and topics in the field of online business.

The Summit, to be held between March 27-31 in Beirut, will bring together leading experts from the global web and mobile industries with digital professionals and entrepreneurs from across the Arab world.

Interpol said that 25 suspected members of the loose-knit Anonymous hacker movement have been arrested in a sweep across Europe and South America.

The international police agency said in a statement Tuesday that the arrests in Argentina, Chile, Colombia and Spain were carried out by national law enforcement officers working under the support of Interpol's Latin American Working Group of Experts on Information Technology Crime.

With its own fortunes sinking, Yahoo is angling for a windfall from rising Internet star Facebook.

The effort will hinge on the latest in a series of high-tech tussles over intellectual rights. Yahoo and Facebook are sparring over whether Facebook's eight-year-old social network relies on some of the innovations that Yahoo has patented or acquired since it launched its website in 1994.

Twitter said Tuesday it was expanding its advertising program to mobile users, the latest bid by the short-messaging service to boost its money-making efforts.

The San Francisco-based company said users of Apple's iPhone and Android devices would begin seeing "Promoted Tweets" in their timelines in the coming weeks.

Spanish police arrested four suspected hackers of the subversive online movement Anonymous accused of sabotaging websites and publishing confidential data on the Internet, officials said Wednesday.

They are suspected of hacking political parties' and companies' websites and adding fangs to the faces of leaders in photographs online, and publishing data identifying top officials' security guards, police said in a statement.

Telepresence colossus Polycom is connecting secure workplace video-call systems with hot smartphones to stay in synch with a trend toward people using their own gadgets on the job.

Polycom RealPresence Mobile, which will be released in early March, will let business IT managers safely open in-house networks to high-definition video calls with laptops, tablets, or Apple iPhone 4S or Android 4.0 smartphones.

Mozilla, which brought the free web browser Firefox to the masses, now wants to do the same for mobile users, with a new open source operating system that could drastically slash smartphone prices.

Yahoo! has accused Facebook of infringing on 10 to 20 patents and warned the social network to pay licensing fees or prepare for a possible lawsuit, the New York Times reported.

The two companies discussed the matter on Monday, the Times said, citing unnamed individuals with knowledge of the matter.

Anonymous defended WikiLeaks when it was facing a funding cutoff, but the release of the Stratfor emails appears to be the first direct collaboration between the hackers and the anti-secrecy site.

WikiLeaks founder Julian Assange was coy about the source of the more than five million emails from the Texas-based private intelligence firm which his secret-spilling site began to publish on Monday.