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I think I have done it in the past but I cannot remember how to link to a previous post... I wanted to post a link to a post that I made in the comment of a post of a friend, but I cannot figure out how to do it!

Can anyone help me? +Yifat Cohen do you know (since you are my Google+ go to person!) :-)
Yifat Cohen's profile photoRajini Rao's profile photoJohn Bankson's profile photo
Right click on the time of the post you want to link to, and Copy Link Address
You can't link to a specific comment but you can link to any post by clicking on the time stamp associated with it. That takes you to a new page. Copy the url associated with that and paste it where you want. Clicking on that link takes you to the post. (I usually shorten the url using google url shortener).