I implore everyone commenting here to;
a) Listen to the actual statement [1] (or even better debate) - DO NOT take what CNN, Metro or anyone other news outlet says for granted. Journalists want to sell newspapers/adspace, parliamentary debate is often not the most glamorous thing in the world, so there is a certain need to spice things up. Reporting can be factually accurate while remaining bias or even misleading.
b) Do NOT draw unconditional comparison with incidents in Libya, Egypt or Norway. It's ignorant and more than anything belittles events in those countries.
c) Understand that the reporting of these riots by the international community, or more importantly the profiling of those involved, has been unreasonably flattering. The absolute majority of people in the UK have no sympathy for these people. This is not a class, race or age issue. Clearly, I cannot speak for all British citizens, but the only people I've seen with anything complementary regarding those involved in the riots (and I say riots, which are separate from the initial protests, which are a whole other kettle of fish) are ill informed and closed minded. This is not an uprising of the social underclass - it's rioting by a tiny fraction of people who have been systematically failed by elements of multiple governments' social, economic and education polices, but that does in no way give them to right to behave as they have. Many thousands more are in the same situation and did not participate, but rather displayed horror at the events.
This is not meant to be inflammatory - there are many problems which need to be addressed, both in terms of policy, as well as the more worrying collapse of morals and underlying social detritus which again is very much not a class, race or age factor. These riots are symptomatic of that.
However, in no way did David Cameron (who is not my favourite person in the world) propose an all out social media ban, and I feel that by omitting the ("... for rioters") in this title is somewhat misleading. The government will discuss the situation with the companies at hand (initially RIM/Twitter and Facebook), and if a workable solution presents itself, this will be debated in parliament. David Cameron is not an expert on social media, but would you expect him to be? That is the reason for these meetings. That is how democracy works.
This is not a knee-jerk and blanket reaction (as seen in Egypt/Libya) but one that will go through proper process. There is already an e-petition which has attracted enough supports to force governmental debate on the subject of removing benefits from rioters [2], a poorly thought out move in my opinion, but one that will nevertheless be debated by parliament. People are angry, and the government must respond to that without being too heavy handed. This is not straightforward, but equally a lack of review regarding social media's impact on the riots would be irresponsible.
d) (And not really relevant here at all, but it's been winding me right up) BlackBerry is a brand of phone. RIM is the company that makes that phone. Officials cannot talk to "BlackBerry", they talk to RIM - it's like saying officials will talk to "BigMac".
[1] - http://www.number10.gov.uk/news/pm-statement-on-disorder-in-...
[2] http://epetitions.direct.gov.uk/petitions/7337