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A reader writes:

From what I can see of Google Analytics it cannot track conversions to paid memberships unless they happen at the time someone registers on my site.

Do you know of any software that could for example identify where a member came from (i.e. how they arrived at my site) and subsequently (perhaps 3 months later) upgraded to a paid membership?

This is a great question. Are dating sites using third party solutions or something created in-house to track conversions?