Who called from 6176822732

Text message to go to a chat site.

Same. Asked me to go to socialcoupling.com to username xosarah1

same

"Hey it's Sarah i just put some pics up on mt profile on socialcoupling.com"

How does she get our phone numbers?

They don't get your numbers.  It is a piece of crap software that sends text messages to all numbers in sequence. No need to actually know the number they are texting to.  Forward the text to 7726.  Most carriers use that number for reporting of spam text messages.