We’ve seen the Instagram community grow from 1 million to over 15 million users in 2011. To celebrate, we’re recapping the year’s activity in our Year in Review series.

January

NPR (@npr)

Celtics (@celtics)

charity:water (@charitywater)

February

Ben & Jerry’s (@benandjerrys)

March

The Washington Post (@washingtonpost)

April

The National (@ntnl)

Young the Giant (@youngthegiant)

Jamie Oliver (@jamieoliver)

May

NASA Goddard (@nasagoddard)

General Electric (@generalelectric)

June

MC Hammer (@mchammer)

Linkin Park (@linkinpark)

July

SFMOMA (@sfmoma)

Ryan Seacrest (@ryanseacrest)

Justin Bieber (@justinbieber)

Selena Gomez (@selenagomez)

August

Jamie Beck (@_frommetoyou)

Banana Republic (@bananarepublic)

September

Tiffany & Co. (@tiffanyandco)

Bon Iver (@boniver)

October

Puma (@puma)

Taylor Swift (@taylorswift)

November

Zooey Deschanel (@zooeydeschanel)

December

Floyd Mayweather (@floydmayweather)

Nike (@nike)

Be sure to check out our Notable Users Directory, which lists many more fashion, food, music, news, sports & venue/event accounts that have been utilizing Instagram since we first launched through today!