CRO since 2009 for Avis, Canon, Nike, Toyota … | CRO agency owner + scaling €90k MRR subscription business | 🎓 PhD dropout

London | Cape Town
Joined July 2008
Johann Van Tonder retweeted
Replying to @ns123abc
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Johann Van Tonder retweeted
Replying to @danallison
Current workflow, all in VSCode: - opus 4.6 writes brief - codex 5.3 (high) implements - sonnet 4.6 does code review - repeat steps 2-3 for blockers, create Linear issues for rest and offload those to codex app
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Johann Van Tonder retweeted
Replying to @DTCMidas
My copywriting skill md outlines broad process, each calling a specific skill - message mining - sales message hierarchy - competitive message analysis - product positioning matrix etc It goes through all of this and dumps working files in /Builds Then points to copywriting frameworks in /references folder - Schwarz awareness states - Hopkins benefits framing and specificity - Caples headlines etc Updates memory .md with my feedback so it constantly improves (in theory) Gets me about 80% of the way with me swearing at it towards the end
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Johann Van Tonder retweeted
Replying to @wifigery
I was around in 1999 when we asked the same question of the internet. Many jobs disappeared. Even entire industries. Many more jobs were created. Even entire industries. It’s fun, enjoy the ride!
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Johann Van Tonder retweeted
"it's slop" "your code won't work" "security vulnerabilities" "landing site has a gradient" meanwhile i'm watching all the lines that i want to go up, go up
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Johann Van Tonder retweeted
Replying to @GaryMarcus @FT
As a lawyer who uses LLMs every day at work, I feel qualified to respond. First, hallucinations are no longer a problem. Consistent with the prediction you quoted from 2023, GPT-5.x almost never hallucinates. And overall, the percentage of inaccurate responses I get from GPT-5.2 Pro is lower than the percentage of inaccurate responses I would get from a competent junior associate (yes, fully accounting for hallucinations). Second, people wildly overestimate the difficulty of most tasks performed by lawyers. The vast majority of the things we do are not nearly as challenging intellectually as solving an Erdos problem. Key skills for a lawyer are attention to detail, ability to synthesize and reason through precedent, ability to construct logical arguments, writing, research. LLMs are *very* good at most of these things even today, and top-tier LLMs (GPT-5.2 Pro) are excellent at them. Put in another way, I feel that the biggest barrier to widespread adoption of AI by lawyers today is connectivity, interfaces, harnesses - *not* intelligence of the best models, and certainly not hallucinations. Unclear to what extent these issues will be resolved in the next 12-18 months, but given how economically valuable lawyers' work is, I wouldn't be surprised to see significant progress on that front. It's also worth considering that, given the general trend of rapidly falling costs of running reasoning models, it is likely that a model as intelligent as GPT-5.2 Pro, but *much* cheaper and faster, will be publicly available in the next 12-18 months. Note that the above assumes (conservatively) that the next 12-18 months in AI will be relatively boring: no continual learning, no drop-in virtual employees, not much further progress in agentic AI (Codex), no significant progress in intelligence possessed by the best models. Relaxing these assumptions would mean that we should expect even faster progress.
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Johann Van Tonder retweeted
Peter Steinberger 🦞
@steipeteFeb 12
Folks, please don't build bots that automatically reply to stuff on X, or use AI to reply. It makes this site annoying to use, I can barely keep up with the blocking. If you use AI to "tweak" your real replies, it will still smell like AI. Embrace typos and imperfect grammar.
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Johann Van Tonder retweeted
Hacker : I have all your passwords Me : OMG thank you what are they
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Johann Van Tonder retweeted
Replying to @naval
i disagree with this sentiment. i’ll observe that software engineers with 10+ years of experience seem to be the worst here because they’ve devoted a decade+ to their craft, and it’s hard to accept that ai is democratizing the creation of software. “surely the stuff that vibecoders are building must be slop!” a) i don’t like this because it inherently shames beginners who are trying to build. anyone who wants to build things should be encouraged to at all times. b) it underestimates the progress of ai models and tools for coding. if beginners write “bad code” today, the opus 5 model in 6mo will fix it. tech debt deflation is very real. how many people got to experience the magic of claude code with opus 4.5 over the holidays? a lot! they got to build personal apps and explore ideas via software in a way that was previously completely locked to them. imo the “ai code as slop” idea is something that shouldn’t be propagated. the world will build 1000x the amount of software, much of this will just be hobbyist software, and that’s a good thing! i don’t want to put words in your mouth ofc, but i do think that if we avoid stigmatizing ai coding as mass produced slop then we’ll ultimately encourage more building, and a world with more creators is inherently good.
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Johann Van Tonder retweeted
a mathematical habit I find useful for product thinking: in the limit, what does ... look like? for example, what will human-AI interaction look like in due time? then walk backwards from the limit and ask: how fast does it converge? how fast can you make it converge? oftentimes, if reasoning from first principles, this reveals to be much faster than you would have thought initially if you ask these questions about the right subjects, from this exercise you derive a product vision and a plan of execution that can win
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Johann Van Tonder retweeted
The original Nokia ringtone, known as the Nokia tune, is derived from a piece of solo guitar music called Gran Vals, composed by Francisco Tárrega in 1902. 📹 alexaguitarist xitter.cf/Earthlings10m/status/1…
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Johann Van Tonder retweeted
Olipop sells soda that's good for your gut health (or that's the claim at least). When they made that salient, sales were meh. When they positioned themselves as a delicious behavior and, "oh wait! This just so happens to be good too!" sales improved drastically.
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Johann Van Tonder retweeted
Just a quick reminder that if you haven't downloaded your Universal Analytics data out of GA, you have just 14 days to do so before it is gone... forever!
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Johann Van Tonder retweeted
Struggling to connect with your audience on a deeper level? Here's a simple five-step process to transforms buyer personas from mere profiles to powerful tools for engaging your audience. (1/4)
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Johann Van Tonder retweeted
Frequent attempts here by CROs to explain #abtesting statistical significance in simple terms Invariably only exposes their own lack of understanding An explanation is either simple/intuitive, or correct/foolproof - but not both (Greenland et al 2016) ncbi.nlm.nih.gov/pmc/article…
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Johann Van Tonder retweeted
CEO: What’s a good conversion rate for our site? Analyst: One better than last month’s. CEO: I’d like to have an industry benchmark. Analyst: We should focus on our own number and improving it. CEO: Yes. So what’s a good conversion rate for our industry? Analyst: 😕
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Johann Van Tonder retweeted
“I don’t know” Often that’s the right answer. Own it.
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Johann Van Tonder retweeted
This is true unfortunately But it’s even worse: many don’t really know what statsig means. They *think* they do... So there’s an overreliance on statsig, wrongly interpreted @ronnyk and @lukasvermeer explain in this recent paper researchgate.net/publication…
I see a lot of CRO Agencies do one MAJOR mistake which makes their work completely worthless: They run a Test and evaluate results without hitting statistical significance. This is how to actually analyze and evaluate results:
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Johann Van Tonder retweeted
Myth busted: Paradox of Choice The ‘jam study’ is often cited in UX & CRO to support less-is-more heuristic However, subsequent studies contradicted this and added layers of understanding👇 Do you know the 🍺 beer study? Tweet 6
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Johann Van Tonder retweeted
1/7 Importance of AB-testing well documented (eg "surprising power of online experiments", Harvard Bus Review) Also true for startups? Researchers at Duke & Harvard studied 35k firms, found evidence #abtesting improves startup performance 👇 pubsonline.informs.org/doi/a…
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