You can measure interest more objectively by seeing how many start down a career path, for example. Another measure could be to look at proxies to interest - su

You can measure interest more objectively by seeing how many start down a career path, for example. Another measure could be to look at proxies to interest - such as hobby programming as a proxy for interest in computing, or reading books as a proxy for writing. But, those are much harder to measure than just counting "likes" on a web form.