I came across a post on Quora addressing why LinkedIn uses tokens like *1_*1_*1_*1_*1_* in their url. The answer mentioned these help track where a user came from to enable a user to return to where he came from.

How exactly does the URL store that type of information, and why would they use that token instead of something more conventional, such as ?last=this-page?

url query-string
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