Trying out different social media channels

After two weeks since launching the site, it has a live Instagram profile, Pinterest profile and Facebook profile.

On Instagram, simply posting one picture per day Teapster has got more than 120 followers and on average 10 engagements of each post.

On Facebook, having spent 5 EUR, it has 15 followers and almost no engagement.

On Pinterest, having spent almost 100 EUR, it has 3 followers and no engagement.

Am I doing something wrong or are Facebook and Pinterest really no longer a thing?