Duration of storage
Google.com _ga files
Google analytical and advertising files. They allow for monitoring the activity on the site of individual visitors and how they use the site. These cookies are set on the first visit to the site and updated on subsequent visits.
2 years from saving / updating
Google _id files
Google DoubleClick for customizing ads that appear in coordination with YouTube
Facebook c-user datr dpr fr sb spin xs files
Facebook advertising files. They are used for customizing the ads displayed on Facebook
Solfinity session files
The files provide the ability to log in, maintain sessions and ensure the security of the connection, including encryption.