Mostly we find use of 'Hmmm' in topics comments by users, when someone finds no words, he writes in his cmnt "Hmm". And now a days I see & understood that it is very easy to grow our +s rate high by using "Hmmm". 
Hmmm
12 replies
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#1 ya...true...I also comment sometimes... hmmmm
#2 Hmmm!!!
#3 Uhmm....
#4 Hmmm ...
#5 Thts got multiple meaning.. Hmmm...
#6 Hmmm 
hmm
Indicating thinking or pondering.
Hmm... that's an interesting idea.
Hmm... I just can't decide between the pulses.
A demand for an answer to a question.
Just where were you until this forum ?
Answer ... Hmm ?
hmm
Indicating thinking or pondering.
Hmm... that's an interesting idea.
Hmm... I just can't decide between the pulses.
A demand for an answer to a question.
Just where were you until this forum ?
Answer ... Hmm ?
#7 HandsomeDon: Hmmm hmm
Indicating thinking or pondering.
Hmm... that's an interesting idea.
Hmm... I just can't decide between the pulses.
A demand for an answer to a question.
Just where were you until this forum ?
Answer ... Hmm ?
Interesting clarifications in detail.
For that 100+es gift from me.
Hmmm hmm
Indicating thinking or pondering.
Hmm... that's an interesting idea.
Hmm... I just can't decide between the pulses.
A demand for an answer to a question.
Just where were you until this forum ?
Answer ... Hmm ?
#8 shane_stark: ya...true...I also comment sometimes... hmmmm
Not sometimes, but I think if your hmmm would be counted, flood will come.
#9 saahir:
Not sometimes, but I think if your hmmm would be counted, flood will come.
#10 Lolz
#11 Hmmmm good topic for discussion bro 
#12 unh