Privacy Policy
This site is a static directory of links. Here is exactly what it records, what it does not, and how to switch each part off.
What we actively collect
Two things only: Google Analytics 4 traffic measurement, and interface preferences kept in your browser. There is no sign-up, login, comment box or checkout, so we never ask for your email, name or phone number.
Preferences are your light/dark theme, the sites you star, and the sidebar section you expanded. They live in localStorage on your own device under nav-theme, nav-fav and nav-open-sec, are never sent to us, and disappear when you clear browsing data.
Server logs
The site runs on nginx, which writes the standard web-server access log: IP address, request time and path, HTTP status code, referer and user agent.
Those logs are used for troubleshooting, abuse detection and security only. They are rotated daily, compressed, and kept for no longer than 14 days.
Google Analytics 4
We use Google Analytics 4 (measurement ID G-5X2CXV6F7W) to see page views, referrers and rough regions, which tells us which sections are worth maintaining. It uses cookies and device identifiers; data is processed by Google and may be transferred to its servers outside your region. We only read aggregated reports and make no attempt to re-identify anyone.
You can opt out with Google's browser add-on: https://tools.google.com/dlpage/gaoptout/
Advertising and cookies
The site shows Google AdSense ads through auto ads: Google decides the placement, size and number of advertisements based on the page and the visitor's environment. We do not write, select or order any of them, and we are not told which advertisers they belong to.
To load advertising, this site requests Google's ad script from your browser. As the third-party vendor, Google and its partners may place and read cookies in your browser when you visit this site, and may use web beacons (pixel tags) or your IP address to collect information for serving, personalising and measuring ads. Google may serve ads based on your earlier or later visits to other websites.
In that process, Google will only associate information about your interaction with ads on this site with other information it already holds about you. We do not pass Google any information that directly identifies you (name, email address, phone number), because we never collect it.
Google publishes a single authoritative explanation of what it does with data collected on partner sites. Please read it directly: https://policies.google.com/technologies/partner-sites — "How Google uses information from sites or apps that use our services".
You can manage or turn off personalised advertising at any time in Google Ads Settings (https://myadcenter.google.com/ and https://www.google.com/settings/ads); to opt out across other advertising networks, use https://optout.aboutads.info/. Those pages are maintained by Google or by industry bodies, not by us, so follow their current wording.
Ads may still appear if you turn personalisation off — they will simply be less relevant. Whether an ad is shown never changes which links we list or in what order.
Visitors from the EU/EEA and UK — consent
Serving personalised advertising to visitors in the European Economic Area (EEA) and the UK requires the publisher to obtain consent that satisfies local law; Google's requirement for this is a Google-certified consent management platform (CMP) that collects and records that consent. This site meets the requirement through the consent message feature provided by Google AdSense.
On your first visit from the EEA or the UK, if that feature is switched on, you will see a consent prompt first, and advertising cookies load only after you have chosen; your choice is recorded and can be changed at any time from the privacy options entry point on the page.
While the consent feature is not enabled, this site does not serve personalised advertising to EEA and UK traffic. If you saw no consent prompt, that consent flow was not active for your region at the time and you were shown either non-personalised advertising or no advertising.
What this site does not do
It does not collect precise location: no GPS, Wi-Fi positioning or cell-tower data is used, and your exact coordinates are never inferred.
It sets no cookies on its own domain: interface preferences (theme, starred sites, the expanded sidebar section) live in browser local storage and are never uploaded.
It builds no visitor profiles: no cookie lists, audience lists, device fingerprinting or cross-site tracking scripts. The site's code also has no ability to read your contacts, clipboard, camera, microphone or local files.
US state privacy rights
For California and other states with consumer privacy laws in force: this site does not sell or share your personal information as those laws define it, because it does not collect information in a way that identifies individuals and holds no data asset that could be sold. You are welcome to write to us to ask about, or ask us to delete, any record relating to this website.
Third-party links and content ownership
This is a directory: the bulk of each page is another site's name, a one-line description and a link. Once you click through you have left us, and that site's own privacy practices apply. We cannot bind them on your behalf, so check their terms before anything important.
Names, marks and material of listed sites belong to their owners; we use them only to identify and navigate to them.
Search submission (IndexNow)
We submit URL lists to the IndexNow endpoints used by Bing, Yandex and other engines. That payload contains which addresses changed and nothing about visitors — no IPs, no cookies.
Children
The site is intended for study and research generally, is not directed at children under 13, and we do not knowingly collect their personal information. Write to the address below if you believe a child's information has reached us through this site.
Your rights and how to reach us
Because we hold no account data tied to an identifiable person, there is usually nothing to delete. For questions about logs, measurement or ad processing — or to ask us to correct or remove a listing — write to jiangnan.chemistry@gmail.com. Letters naming the exact URL are handled fastest.
Changes to this policy
When the site changes in a way that touches data (a new form, a different measurement or ad provider, a new log retention period) this page is updated and the effective date at the top moves. Continuing to use the site means you accept the current version.