[filip01]

Could someone explain why "signals of growth", or as in this case "momentum", would be relevant to anyone? I understand that actual growth stats might be difficult to get hold of, but I think I'd rather have 200 of those than 200 000 "weekly growth of web traffic, mobile downloads, inbound links, employees, and social media".

[GamblersFallacy]

I'd suggest "signals of growth" & "momentum" are a proxy for a site that has repeat traffic & systematic word of mouth. You can't maintain the momentum of growth unless you retain a significant number of new visitors.

If new visitors are developing the habit of repeat visits, thats a strong signal the startup has discovered a formula that strikes a chord with their niche/market.