You've probably seen these around the web.
OVER 9,000,000 PEOPLE SIGNED UP LAST WEEK.
Whilst it's nice to boast we've noticed almost zero lift in conversion from these additions to the page.
Often when someone has hit your landing page they've already interacted with your brand before so have an idea of your size and if not, then they'll dig around and find engagement elsewhere (blog comments, post comments, reviews, etc).
Show, don't tell.