It was pointed out above, but the In-Q-Tel involvement in Facebook is seriously tenuous;

    The second round of funding into Facebook ($US12.7
    million) came from venture capital firm Accel Partners.
    Its manager James Breyer was formerly chairman of
    the National Venture Capital Association, and served
    on the board with Gilman Louie, CEO of In-Q-Tel, a
    venture capital firm established by the Central
    Intelligence Agency in 1999. One of the company's
    key areas of expertise are in "data mining
    technologies".

So the evidence for an investment is that Facebook's lead investor for their Series A was the Chairman of the NVCA, of which the CEO of In-Q-Tel was also a member (along with 7 other prominent VCs). That's it.. an investor was on a board with the CEO of In-Q-Tel.

None of Facebook's SEC filings ever showed a single dollar from In-Q-Tel and they're not shy about publicizing what they've invested in:

https://www.crunchbase.com/organization/in-q-tel/investments

Interesting, I'd heard it mentioned a number of times and I just assumed it was true.