By Dan Primack
August 13, 2012

FORTUNE — Rep. Paul Ryan (R-WI) has 187,000 followers on Twitter, plus nearly 100,000 followers on a new account set up by the Romney campaign. Oh, and he’s also a tiny investor in the micro-messaging site.

According to Ryan’s most recent financial disclosures, he held between $50,000 and $100,000 in the T. Rowe Price New Horizons Fund as of Dec. 31, 2011. It’s his largest single holding, outside of some 529 college savings plans.

For those unfamiliar, New Horizons is a small growth fund known for occasionally investing in hot tech companies before they go public. Among those is Twitter, in which the fund holds nearly 4.61 million shares. The acquisition was made in September 2009 for approximately $12,000, and was valued at nearly $74,000 at the end of Q1 2012.

That means Ryan is an indirect holder of Twitter stock, valued at somewhere between $25 and $50 (assuming his $50,000-$100,000 holding was still valid on 3/31). As I said, it’s a tiny stake. Other private companies in the New Horizons portfolio include LivingSocial, Glam Media, Odesk, Silver Spring Networks, WorkDay and Zulily

For more on Ryan’s portfolio — including shares of Berkshire Hathaway

and Apple

— check out this piece by Maureen Farrell.

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