I've seen reports on WRTV. They emphasized that they do appreciate valid tips, but apparently some of the "tips" are based on other motives, or else just not legitimate. Lots of facebook/social media "detectives" I think that are just serving to muddy up the waters.
I've seen this and other articles, but the ones I've seen didn't say anything about them being overwhelmed. The 42,000 number is since the start of the case. Since the recent press conference, there's been a couple of thousand. My guess is they'll give priority to tips given since the press conference, since those would be based on the latest info. I get the impression that once the guys name comes up, it's only a matter of time.