Кирилл Фирсов

var services = {
	facebook: {
		counterUrl: 'http://graph.facebook.com/fql?q=SELECT+total_count+FROM+link_stat+WHERE+url%3D%22{url}%22&callback=?',
		convertNumber: function(data) {
			return data.data[0].total_count;
		}
	},
	twitter: {
		counterUrl: 'http://urls.api.twitter.com/1/urls/count.json?url={url}&callback=?',
		convertNumber: function(data) {
			return data.count;
		}
	},
	vkontakte: {
		counterUrl: 'http://vkontakte.ru/share.php?act=count&url={url}&index={index}',
		counter: function(jsonUrl, deferred) {
			var options = services.vkontakte;
			if (!options._) {
				options._ = [];
				if (!window.VK) window.VK = {};
				window.VK.Share = {
					count: function(idx, number) {
						options._[idx].resolve(number);
					}
				};
			}

			var index = options._.length;
			options._.push(deferred);
			$.ajax({
				url: makeUrl(jsonUrl, {index: index}),
				dataType: 'jsonp'
			});
		}
	}
};

/**
 * Counters manager
 */
var counters = {
	promises: {},
	fetch: function(service, url) {
		if (!counters.promises[service]) counters.promises[service] = {};
		var servicePromises = counters.promises[service];

		if (servicePromises[url]) {
			return servicePromises[url];
		}
		else {
			var options = services[service],
				deferred = $.Deferred(),
				jsonUrl = options.counterUrl && makeUrl(options.counterUrl, {url: url});

			if ($.isFunction(options.counter)) {
				options.counter(jsonUrl, deferred);
			}
			else if (options.counterUrl) {
				$.getJSON(jsonUrl)
					.done(function(data) {
						try {
							var number = data;
							if ($.isFunction(options.convertNumber)) {
								number = options.convertNumber(data);
							}
							deferred.resolve(number);
						}
						catch (e) {
							deferred.reject(e);
						}
					});
			}

			servicePromises[url] = deferred.promise();
			return servicePromises[url];
		}
	}
};

function makeUrl(url, context) {
	return template(url, context, encodeURIComponent);
}

function template(tmpl, context, filter) {
	return tmpl.replace(/\{([^\}]+)\}/g, function(m, key) {
		// If key don't exists in the context we should keep template tag as is
		return key in context ? (filter ? filter(context[key]) : context[key]) : m;
	});
}

var url = 'http://habrahabr.ru';
$.each(services, function(service) {
	counters.fetch(service, url).done(function(number) {
		number = parseInt(number, 10);
		if (!number) number = 0;
		console.log(number);
	});
});