how can I pass a parameter in a URL to a link on the page. So we have this link setup for all visitors from Facebook.
http://www.domain.com/event?source=facebook
We need to pass the source to the end of a link on the page which leads to a booking engine and registers as a conversion so that
http://www.bookingengine.com/tickets/1234/?ticket=567&event=8910
becomes
http://www.bookingengine.com/tickets/1234/?ticket=567&event=8910&source=facebook