Companies might choose to block users in particular countries from accessing their sites, rather than be subject to those countries' laws, or decide against doing business online altogether.
We have had to make the decision to block all users accessing geographically restricted content via 3G cards.
Odigo made its software interoperable with AOL's AIM and ICQ messaging services last year only to have AOL block Odigo users after a couple of weeks.
In an interview with Paris-based daily newspaper La Liberation published Friday, Jerry Yang, co-founder of Yahoo, said that, while the company's French subsidiary would respect French law, he doubted that French courts could make a U.S. company block French users from accessing the content of its U.S. servers.
The stumbling block: Napster users are anonymous to each other and trade on a massive scale.
It should be noted (and commended) that Sprint and Verizon allow users to block numbers for free.
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Software filters to block under-age users are unlikely to work, because young geeks will find ways around them and share them with all their friends.
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Apple wants to own a generation of post-PC world users and block out their competitors until such time as they can present a higher-quality user experience than Apple.
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Users could also block others from interacting with them.
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The means to block out certain sites from Malaysian users exists.
"We don't understand how Facebook could block the access to millions of users of the Vintage Camera application who want to share their photos on Facebook, only because of a few negative feedback reports, " Mr Morcos wrote in a press statement.
Also some unscrupulous companies produce fake programs that claim to help users get rid of spyware or block spam but which make sure they receive only ads and spam from the software maker's partners.
Due to a French law making it illegal to exhibit or sell objects with racist overtones, a Paris court last month ordered U.S.-based Yahoo to report back on July 24 exactly how the company plans to block access to the Nazi material from French Internet users.
Finally, hiding messages widely amid otherwise-legitimate content makes it difficult for a censor to block communication effectively without also causing significant disruption to innocuous users.
The company plans to report back to the court, but in the meantime, it has filed an appeal to the order to block access to its U.S site to French users, the spokeswoman said.
Intrepid users of Adblock Plus can set it up to also block the sponsored results that make up nearly all of Google's revenue.
Google's activity on Safari browsers came despite a Google Web page that assured Apple users they could rely on Safari's privacy settings to block unwanted tracking.
The worm has mostly attacked home users who are less likely to update antivirus software or use firewalls that block IRC traffic, according to Carey Nachenburg, chief researcher at Symantec Corp.
Over the past several months, Sprint, which is in the process of being acquired by Japanese-controlled wireless carrier Softbank, has petitioned the FCC to drastically reduce the power levels of DISH's spectrum to further Sprint's desire to acquire the neighboring H Block spectrum, which today is essentially a vacant lot with no current licensees or users.
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Just this week, the English High Court ordered six of the country's Internet service providers to block access to the Swedish site The Pirate Bay on the grounds that it induced its users to infringe copyright.
Users must wear special glasses with built-in headphones to view one programme and block the other.
Second, a stumbling block could emerge from ICANN's efforts to hold an open and fair election among all Internet users to choose nine new members for its 19-member board.
That jailbreak was used more than 18 million times by iOS users eager to hack their iPhone, iPads and iPod touches before Apple updated their software to block the exploit in March.
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After flunking Privacy 101 with Buzz, which automatically built a public social network using Gmail users' formerly private contact lists, Google has designed a social network with privacy as its building block.
For those of you without kids or who live on a remote island without a broadband connection, Minecraft is a legitimate worldwide phenomenon, a building block video game that launched in 2009 and now has over 8 million paying customers and a total of 40 million users worldwide, its own conference, and a legion of YouTube stars.
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