First of all you would have to find out, what Facebook uses to create those previews. I would assume that the html description would be the first thing it uses. If your survey template does not use text in the description tag, then you might just add some and see what happens.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.
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