Activist investor Carl Icahn said in a press release that he plans to embrace a far more modern form of communication, the popular social-media site Twitter, to issue statements to the public.

Mr. Icahn, who first issued a tweet in June and has amassed a relatively paltry 25,741 followers, encouraged investors, the media and others interested in Icahn Enterprises LP (IEP) to review the information he posts on Twitter in addition to details on the company's investor relations website, press releases and Securities and Exchange Commission filings.

The highly profile investor's embrace of Twitter comes roughly four months after the SEC said that postings on sites such as Facebook Inc. (FB) and Twitter are just as good as news releases and company websites as long as the companies have told investors which outlets they intend to use.

That statement was sparked by an investigation into a Facebook posting by Netflix Inc. (NFLX) Chief Executive Reed Hastings, who boasted on the social-media site that the streaming-video company had exceeded one billion hours for the first time, sending the firm's shares higher. The SEC ultimately didn't levy any civil charges against Mr. Hastings or Netflix related to the initial Facebook posting.

Mr. Icahn's Twitter handle is @Carl_C_Icahn, and while the investor signaled his intention to use the site as a form of communication, he hasn't been a very active user the past few months. He has sent out 10 tweets from June 20 to Aug. 5, the last time he issued a tweet on the site.

His first tweet? "Twitter is great. I like it almost as much as I like Dell." Mr. Icahn has filed a legal challenge to Michael Dell's buyout for the personal-computer maker, as the two are locked in a battle over the future of the company.

Write to John Kell at john.kell@wsj.com

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