APIs are used to load scripts: geolocation, search engines, translations, ...
Ad networks can generate revenue by selling advertising space on the site.
The audience measurement services used to generate useful statistics attendance to improve the site.
Comments managers facilitate the filing of comments and fight against spam.
Social networks can improve the usability of the site and help to promote it via the shares.
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Support services allow you to get in touch with the site team and help to improve it.
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Video sharing services help to add rich media on the site and increase its visibility.