Looking on the internet deeply has found these results:

it was nice meeting you is the most popular phrase on the web.

it was nice to meet you 134,000 results on the web	it was nice meeting you 1395,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Dec 2, 2010 ... My theory: it was nice to meet you is used if you have been introduced to sombody but have not had time to get to know him/her at all, whereas ... Sep 5, 2009 ... It was nice to meet you in Prague last week at the symposium. I am still laughing at your story about getting lost in Copenhagen. You said you ... Jun 4, 2011 ... When one makes a new acquaintance with somebody in person, you may say "it was nice to meet you", e.g. when you leave. What if you make ... It is nice to meet you. 2. It was nice to meet you. 3. It has been nice to meet you. 4. It is nice meeting you. 2. It was nice meeting you. 3. It has been nice meeting ...	It was nice meeting you, Jack. Right, it was nice meeting you. In that case, it was nice meeting you, Noah Solloway. It was nice meeting you, Sheriff. Thank you so much. So unless you're into doing this case pro bono, it was nice meeting you. It was nice meeting you, Elena. It was nice meeting you, Leslie. So it was nice meeting you.

it was nice to meet you

134,000 results on the web

it was nice meeting you

1395,000 results on the web

More popular!

Dec 2, 2010 ... My theory: it was nice to meet you is used if you have been introduced to sombody but have not had time to get to know him/her at all, whereas ...
Sep 5, 2009 ... It was nice to meet you in Prague last week at the symposium. I am still laughing at your story about getting lost in Copenhagen. You said you ...
Jun 4, 2011 ... When one makes a new acquaintance with somebody in person, you may say "it was nice to meet you", e.g. when you leave. What if you make ...
It is nice to meet you. 2. It was nice to meet you. 3. It has been nice to meet you. 4. It is nice meeting you. 2. It was nice meeting you. 3. It has been nice meeting ...