A casual look at LinkedIn shows that Loggly isn't "nearly all male". Of 39 current employees, 30 are male and 9 are female: so 77% -- high, but not "nearly all".
Another stat on Loggly: Liz is the sole female among 20 engineering/QA/Support people. And reasonable people in the field will agree with the statement "software engineering is male dominated". Step outside of engineering and you'll see women often dominate HR, PR, Marketing, and Sales. That's not the case at Loggly, but women are certainly better represented here: of 14 the Loggly employees in those roles, 6 of them (43%) are female.
So why is tech culture male-biased? Rather than saying "tech companies are male dominated", the more accurate and nuanced answer is that (a) smaller tech companies are engineering dominated, and (b) engineering is male-dominated.