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· 5 checks — Internal links, mixed-content guards, Open Graph previews, and structured data rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
1
PASS
2
INFO
0
Checks
5
2 PASS 1 REVIEW 2 FIX
F
Open Graph
Action
Open Graph tags need attention — social sharing previews may be incomplete.
FIX
Open Graph tags need attention — social sharing previews may be incomplete.
Critical::
og:image is not reachable
The og:image URL could not be fetched. Social platforms won't be able to display it.
Got: https://www.polimi.it/fileadmin/asset/logo/polimi_logo.jpeg
Warning::
Missing og:title
The og:title tag controls the title shown in social sharing previews.
Warning::
Missing og:description
The og:description tag controls the description in social sharing previews.
Info::
Missing og:url
The og:url tag specifies the canonical URL for the shared content.
Info::
Missing og:type
The og:type tag helps social platforms categorize the content.
Info::
Missing og:site_name
The og:site_name tag displays the website name in social previews.
URL: https://www.polimi.it/fileadmin/asset/logo/polimi_logo.jpeg

The og:image URL could not be fetched. Social platforms won't be able to display it.

Why this matters

An unreachable og:image URL (404, DNS fail, slow timeout) means social platforms cache the failure and serve no image for hours.

Learn more ▾

Social platforms (Facebook, Twitter) cache OG metadata aggressively — including failed image fetches. A momentarily-broken og:image can leave your shares imageless for hours. Test og:image URLs in Facebook's Sharing Debugger to force re-cache after fixing.

Source: Open Graph Protocol / Facebook Sharing Debugger

The og:title tag controls the title shown in social sharing previews.

Why this matters

Without og:title, social shares fall back to the <title> tag — usually awkwardly truncated or branded for SEO not social.

Learn more ▾

og:title controls what appears as the headline in social-share cards (Twitter, Facebook, LinkedIn, Slack, iMessage). When omitted, platforms fall back to <title>, which is usually optimized for SEO (longer, brand-suffixed) and reads badly in social context. A 50-60-character og:title gives a clean preview.

Source: Open Graph Protocol

The og:description tag controls the description in social sharing previews.

Why this matters

No og:description means social cards either show no subtitle or scrape the first paragraph — usually unflattering.

Learn more ▾

Without og:description, social platforms either render no subtitle or pull whatever text appears first on the page. The first paragraph is rarely written for share-card context. A purpose-written 150-200 character og:description gives a polished card.

Source: Open Graph Protocol

The og:url tag specifies the canonical URL for the shared content.

Why this matters

Without og:url, social platforms infer the canonical URL — often picking a tracking-param variant that pollutes share counts.

Learn more ▾

og:url tells the social platform which URL to count this share against. Without it, platforms use the literal URL the user pasted (which may include utm_* parameters, ref codes, etc.). Setting og:url to the canonical form keeps share-count attribution clean.

Source: Open Graph Protocol

The og:type tag helps social platforms categorize the content.

Why this matters

Default og:type is 'website' but the right value (article, product, profile) unlocks richer metadata fields and higher engagement.

Learn more ▾

og:type controls which other og: fields a platform respects. og:type=article enables og:article:published_time, author, and section — surfaced in news cards. og:type=product enables price/availability fields surfaced by Pinterest and shopping integrations. Default 'website' silently disables those.

Source: Open Graph Protocol

The og:site_name tag displays the website name in social previews.

Why this matters

Without og:site_name, social cards omit the brand attribution — users see the post but not who published it.

Learn more ▾

og:site_name appears in the social card chrome (above the title in Facebook/LinkedIn previews). Without it, posts read as anonymous URLs. Set it to your brand name to get free attribution on every share.

Source: Open Graph Protocol

Preview

polimi.it

No title set

No description

Preview quality · Twitter/X A · 85/100
  • twitter:card — summary
  • twitter:title — falling back from <title>
  • twitter:description — falling back from <meta name=description>
  • twitter:image — falling back from og:image

POLIMI.IT

No title set

No description

Preview quality · Facebook F · 45/100
  • og:title — falling back from <title>
  • og:description — falling back from <meta name=description>
  • og:image — https://www.polimi.it/fileadmin/asset/logo/polimi_logo.jpeg
  • og:type — Add og:type — Recommended — tells Facebook the content category
  • og:url — Add og:url — Recommended — canonical URL for the share
  • og:site_name — Add og:site_name — Recommended — site-level brand line in the preview

  • og:image is below recommended size (200×200)

    → Upload an image ≥1200×630 for the large preview card

No title set

polimi.it

Preview quality · LinkedIn A · 90/100
  • og:title — falling back from <title>
  • og:description — falling back from <meta name=description>
  • og:image — https://www.polimi.it/fileadmin/asset/logo/polimi_logo.jpeg

polimi.it

No title set

No description

Preview quality · Slack A · 90/100
  • og:title — falling back from <title>
  • og:description — falling back from <meta name=description>
  • og:image — https://www.polimi.it/fileadmin/asset/logo/polimi_logo.jpeg

Social preview quality

Averaged across Twitter/X, Facebook, LinkedIn, and Slack.

B · 77/100
FieldTwitter/XFacebookLinkedInSlack
og:title⚠⚠⚠
og:description⚠⚠⚠
og:image
og:type
og:url
og:site_name
twitter:card———
twitter:title⚠———
twitter:description⚠———
twitter:image⚠———
F
Brand Presence
Action
Site-name consistency, favicon, social image, meta tags, schema, and contact signals
FIX

Brand Presence

Partial brand coverage — a few channels are missing brand signals.

F

35/100

Site name appears as

Page titlepolimi
og:site_name—
twitter:site—
Organization.name—

Consistent

Brand assets

Favicon

8/15

single size only

Social share image

14/20

og:image set; twitter:image missing

Meta completeness

8/20

Organization schema

0/15

Contact info discoverable

0/10

no contact info discoverable

Findings

  • Missing brand name in: og:site_name, twitter:site, Organization.name
  • Add twitter:image — Twitter falls back to og:image only when it's larger than 300×157
  • Single favicon only — add apple-touch-icon for iOS home-screen and high-DPI support
  • og:title missing
  • No Organization schema — Google can't render your logo in the knowledge panel
  • No discoverable contact info — trust signal is weak, legal risk is higher in regulated regions

How consistently your brand appears across channels — shared link previews, structured data, favicon, contact info.

A+
Mixed Content
No mixed content detected — all resources use HTTPS.
PASS
No mixed content detected — all resources use HTTPS.
Info::
No mixed content detected — all resources use HTTPS
A+
Structured Data
2 JSON-LD block(s) found — structured data is well configured.
PASS
2 JSON-LD block(s) found — structured data is well configured.
Info::
2 blocks of custom type "CollegeOrUniversity" — unable to validate specific properties
Info::
2 JSON-LD blocks found

JSON-LD Blocks

Block 1 : CollegeOrUniversity
9 properties Valid
{
  "@context": "http://schema.org",
  "@type": "CollegeOrUniversity",
  "name": "Politecnico di Milano - Campus Leonardo",
  "image": "https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/logo.svg",
  "url": "https://www.polimi.it/",
  "telephone": "+39 02 23991",
  "address": {
    "@type": "PostalAddress",
    "streetAddress": "Piazza Leonardo da Vinci, 32",
    "addressLocality": "Milano",
    "postalCode": "20133",
    "addressCountry": "Italia",
    "addressRegion": "Lombardia"
  },
  "openingHours": [
    "Mo-Fr 08:00-20:00"
  ],
  "priceRange": "n/a"
}
Block 2 : CollegeOrUniversity
9 properties Valid
{
  "@context": "http://schema.org",
  "@type": "CollegeOrUniversity",
  "name": "Politecnico di Milano - Campus Bovisa",
  "image": "https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/logo.svg",
  "url": "https://www.polimi.it/",
  "telephone": "+39 02 23991",
  "address": {
    "@type": "PostalAddress",
    "streetAddress": "Via Raffaele Lambruschini, 4",
    "addressLocality": "Milano",
    "postalCode": "20156",
    "addressCountry": "Italia",
    "addressRegion": "Lombardia"
  },
  "openingHours": [
    "Mo-Fr 08:00-20:00"
  ],
  "priceRange": "n/a"
}
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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