Lyre Leads
Why a fixed number flags a shopping mall
Every time we see a business on Google Maps we note its review count, and when a count rises enough between two sightings we flag a review surge. The obvious definition of "enough" is a fixed number, say ten new reviews.
Point that at a shopping mall going from 14,048 reviews to 14,073 and it fires. Twenty-five new reviews sounds like a lot until you divide: it's 0.18%. Museums, hotels and music venues clear the same bar every ordinary month. None of them did anything unusual. They're busy places, and busy places gather reviews.
A fixed number has a second flaw that's easier to miss. It ignores time. Eleven new reviews count the same whether they arrived in a week or across five months, and the gap between two sightings of the same listing can be anything from two weeks to five months.
The rule we use now
A listing has a review surge when, between two sightings at least a day apart:
- it gained at least 5 new reviews, and
- it grew at least 5% per 30 days, relative to the count at the earlier sighting.
The growth rate is the percentage increase scaled to a 30-day month. If the two sightings are 60 days apart, a 12% rise counts as 6% per 30 days. If they're closer than a week, we still scale as if a week had passed, so a jump seen over two days isn't multiplied by fifteen.
Worked examples from real listings
All of these are listings we've actually tracked. The names are left out because they don't matter.
A roofer in Phoenix: 31 to 53 reviews in 46 days. That's 22 new reviews, 71% growth, about 46% per 30 days. That's clearly a surge, and something is happening at that company.
An air-conditioning company in Texas: 1,135 to 1,231 in 45 days. 96 new reviews, 8.5% growth, about 5.7% per 30 days. A surge, just. For a listing that size, nearly a hundred reviews in six weeks is a real step up.
A web designer with 49 reviews that reached 60 over 149 days. 22% growth sounds healthy, but spread over five months it's about 4.5% per 30 days. Not a surge. It's a business collecting reviews at a steady pace.
The mall: 14,048 to 14,073 in 16 days. 0.18%, about 0.34% per 30 days. Not a surge.
A listing going from 2 reviews to 3. That's 50% growth, and one review. The 5-review floor exists for this case.
Measured with a fixed count, the mall and the steady web designer both surged. Measured per 30 days against their own size, neither did, and the two that did are the ones you'd want to call.
Why growth from zero never counts
You might expect a business going from 0 reviews to 50 to be the biggest surge of all. We never flag it, for two reasons.
There's no rate to compute from zero. More practically, a zero is usually a failed read. Google occasionally returns a listing without its review data, so it shows up with no rating and a count of zero, and moments later the real number comes through. In raw data that looks like a property management company "going from 0 to 293 reviews" in sixteen seconds.
A genuinely new business looks the same at the moment of that first sighting. A sighting with zero reviews and no rating can't tell the two apart, so we don't record it at all.
What a surge does and doesn't tell you
A surge means attention. It doesn't say what kind.
Usually it's a busy business: a good season, new locations, a team that started asking every customer for a review. Sometimes it's a deliberate review campaign. Occasionally it's a bad week, with a string of unhappy customers all writing at once. Read the surge next to the rating. A surge with a steady or rising rating is momentum. A surge with a falling rating is a business with a problem, which is a different conversation and, for some sellers, a better one.
Review counts can also fall. Google removes reviews it decides are fake, and older reviews sometimes get filtered. A falling count never triggers anything on its own.
Who should act on a surge
Anyone selling to growing businesses. Staffing, payroll, equipment, insurance, financing. A business getting noticeably more customers is the one about to feel stretched. It pairs well with the hiring signal described in how to find businesses that are hiring.
Marketing and web agencies. A business with rising attention and a website that can't convert it has money on the table, and the surge tells you when.
Not review-generation vendors, mostly. A business already collecting reviews fast has solved that problem. Your better list is the opposite: established businesses with few reviews, covered in finding SEO clients with low reviews.
Keep the opener about them. "Looks like a busy couple of months" works. "I noticed you got 22 new Google reviews" makes people wonder why you're counting.
Filter for Review Surges
Lyre Leads tracks the review count of every business it sees on Google Maps and flags a surge using the rule above, with the before and after count shown next to each one. A surge needs two sightings, so it appears after a business has been seen again. Free plan includes 500 leads a month.
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