Creating a scraper using multithreading
First of all, I think you are putting time.sleep() calls into the wrong places - you are putting them into the loops where you iterate over the extracted elements. Elements are already extracted and no requests are issued at that point - add delays between each requests - at the end of your functions.

I would also improve naming - Yp_link and Tuts_link can be renamed to more explicit YELLOW_PAGES_URL and WISEOWL_URL - note that I think these two need to be defined as proper constants - in upper case. 

And, I would also switch to CSS selector locators for process_links() function as well.

As far as imports go, just don't put them on same lines - put each import on it's own line as per PEP8 importing guidelines.