Heidi Klum Adam Sandler, Drew Barrymore Elizabeth Banks, Lenny KravitzSeth Rogen

2013 was yet another huge year for social media, especially with the growth in Instagram popularity. This year, we saw celebrities like Heidi Klum become instant insta favorites, while also finally getting to enjoy tweets from the likes of Cameron Diaz. Click through to learn more about some of the biggest celebs that finally caved into Instagram and Twitter in 2013.