There could be. You may never know who you're talking to on the other end of the internet but as long as you don't give your personal info you're okay. So don't worry there are people 24/7 watching your conversations.
There is no specific collective noun for 'grown-ups'. Grown-ups is another word for people, the collective noun would be whatever is appropriate for the context of the grown-ups that you're talking about. For example, a council of grown-ups, a team of grown, a crew of grown-ups, a party of grown-ups, a mob of grown-ups, etc.
Grown-Ups was created in 1980.
Grown ups
maybe there will be a grown ups 3
Grown Ups was released on 06/25/2010.
The Production Budget for Grown Ups was $75,000,000.
Grown ups is two words.
Grown Ups - film - was created on 2010-06-25.
Grown Ups 2 was released on 07/12/2013.
Grown Ups grossed $272,223,430 worldwide.
Jake Goldberg's role in Grown Ups is Greg Feder!
Grown Ups was filmed on the Essex River in Essex, MA.