I think it'd be useful to be able to save your favourite posts, countless times where posters refer to old posts but no way of finding them (especially if they've been archived)

Browsers have a great bookmark system. 

And for everything else you could use 

 

1 hour ago, Matt said:

Browsers have a great bookmark system. 

Where's the frowny face reaction?  

1 hour ago, Daniel F said:

And for everything else you could use 

 

This should be part of the core.