Professional networking site LinkedIn is making its entry into the news arena, announcing the beta launch of LinkedIn Today, which aggregates the most-shared headlines related to multiple industries by members of the network. Silicon Alley Insider: LinkedIn Today could help LinkedIn earn more money from advertising as it prepares for its initial public offering this year. NYT / Bits: LinkedIn Today will compete with other general news aggregators, like Google News or Yahoo! News, as well as those that are tailored to a specific industry, like Techmeme, for technology. ReadWriteWeb:It’s hard to see how the curation that will happen on LinkedIn will be different from what happens on other social-network sites, as many people simply duplicate their shares from Twitter, blogs, or feeds to their LinkedIn profiles.