NEW YORK ( TheStreet) -- A month after Carl Icahn disclosed a multi-billion dollar investment in Apple ( AAPL) on Twitter, the billionaire activist investor took to the micro-blogging site again. This time, Icahn announced a 61 million share stake in Talisman Energy ( TLM).

Icahn said in a tweet late Monday that he would speak with Talisman's management about considering strategic initiatives and gaining seats on the driller's board of directors.

"Disclosed approx 61 million share position in Talisman Energy. May have conversations with mgmt re strategic alternatives, board seats, etc.," Icahn wrote on Twitter.

The 61.5 million shares (61,554,602 shares including options) represents approximately 5.97% of the outstanding common stock as of as of July 26, 2013.

Icahn's decision to disclose his investment in Talisman Energy on Twitter follows his creation of an account this summer. In August, Apple's market capitalization surged by $17 billion when Icahn took to Twitter to announce a $2 billion investment in the iPhone maker and a proposal to increase the firm's share repurchase activity.

In subsequent tweets, Icahn said he would meet with Apple CEO Tim Cook about his proposals for the company's capital management. Earlier in October, Icahn said a dinner with Cook and Apple CFO Peter Oppenheimer had been productive, if slightly testy. He expects to follow up discussions on a $150 billion share repurchase plan in coming weeks.

Talisman Energy shares surged over 8% in after-hours trading on Icahn's disclosure of an investment in the Calgary-based oil and gas driller. Talisman Energy shares have fallen over 3% in the past 52-weeks and are under-performing broader markets in 2013.

-- Written by Antoine Gara in New York