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 growt

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.