Is that headline damning with faint praise? Mere "thousands" doesn't seem like enough to get critical mass on a social network. For comparison Google+ had something on the order of 300 million users and failed to get traction.
I'm not sure it matters for this social network. It's positioning as a news-based platform doesn't require people you know personally to use the site in order for it to have value.
Perhaps conversely, too many people on a social network may be detrimental to these aims, as ever more narrow-minded echo chambers or factions can achieve critical mass.