The problem with that, not that it's not a good thing to do, is that a lot of folks will give you a

"Oh yeah, I've been super busy but I'm still definitely interested please don't drop me" response.

And then still just never ever post.  

It's a good approach.  Remind folks of it in case theyve just forgotten, but a lot of the time they'll give you a positive response without any actual intent of posting again.