If you're involved in the stock market but not yet on Twitter, today you were given one more reason to join the social network... a good one.

Famed activist investor Carl Icahn (@Carl_C_Icahn) plans to unveil his next large investment on Twitter, CNBC Fast Money contributor Karen Finerman reported Tuesday.

Icahn is toying with the idea of presenting the idea like a "treasure hunt," with various clues given over time, Finerman said.

The timing of the new pick from Icahn was not learned, but 'Uncle Carl' - as Dan Loeb calls him - moves quick for his age so you better follow him soon. While you're at it @Street_Insider is a great follow on Twitter as well.

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