mwesslau wrote: However, if people click on the link to my survey they are firstly guided to a page that has nothing to do with my survey and looks like spam. If they close it and click again on the same link they are directed to my survey. Anyone ever experience
1. Where is LimeSurvey hosted? Do you use LimeSurvey Pro hosting? Or did you install LimeSurvey on your own?
2. Create a new survey with just one question. Activate the survey and check if you have the same link redirection.
The modification of the URL can be caused via different manipulations.
Currently it looks more like an injected javascript. If you have this redirection issue only when sharing URLS via facebook, it looks like no issue with LimeSurvey installation or webserver.
Try sharing via facebook with different browser (to rule out browser plugins/addons, which modify the URLs when posting).