This is the kind of growth that is possible:

FACEBOOK has 1.65 billion monthly users and 1.09 billion daily active users on average.
The average Facebook user has 155 friends.

TWITTER has 310 million monthly active users.
Of those 83 percent are active users on mobile.
Every second, 6,000 Tweets are sent.

INSTAGRAM has more than 400 million active monthly users.
Of its user base, 75 percent are outside the U.S.
Users have shared more than 40 billion photos.

PINTEREST has 100 million active monthly users.
The average PIN is repinned 11 times.
In 2015 , 3.78 billion DIY Pins were saved Worldwide.
The Pin totaled more then 1.5 trillion recommendations annually.

LINKEDIN has more than 433 million users in more than 200 countries.
Of those, there are 100 million active monthly users.
More than 128 million users in the U.S. alone.
One in every three professionals in the world is on LinkedIn.

Just imagine if you are starting at the ground floor with the next big thing.

These statistics were provided by HOOTSUITE.