Sigh. Another shot, another failed attempt. Yahoo 360 — which is Yahoo’s second major attempt to break into the social networking scene — is quietly folding early next month. The news comes a few years after Yahoo! Mash also faded into the distance, and it’ll be almost two years since Yahoo has devoted any support to the site whatsoever.In an e-mail statement issued by the search company, it informed current Yahoo 360 members that July 13th would be its last day in existence, and in order to “focus our efforts