is it true that 1 in 5 relationships today start with a dating site?

i saw a commercial that stated this today. is it true?

Chosen Answer:

Yes, this statistic is completely factual. 1 in 5 singles have used dating websites and 1 in 5 people have engaged in serious online relationships. These numbers, as well as many others, were found in a recent survey backed by statistical evidence.
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on: 8th May 11

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