In many ways, 2012 was the year of the image, exemplified by the rise of Pinterest, the surging popularity of Instagram (and Facebook’s $1 billion purchase of the photo-sharing app), and the recent spat between Twitter and Instagram.

The trend is likely to continue into the new year, thanks in part to the increase in iPhone and Android ownership.

All of the new people experimenting with Instagram—whether for work or for fun—might have questions about the hashtags users so eagerly apply to photos when they share them on the site. (Even Instagram vets might have questions.)

Unless you’re familiar with the platform’s terminology, you might be unsure what these hashtags denote. This cheat sheet should help you decipher the lingo:

IG – Shorthand for Instagram.

#igers – Shorthand for “Instagrammers,” otherwise known as, Instagram users.

#igersminnesota – Instagram users in Minnesota (or insert other state). It’s a way of tagging posts by area/state/city.

#photooftheday – Instagram hosts a “photo of the day” contest that carries this hashtag. Apply this tag to enter the contest, or search for it to scroll through the entries.

#iphonography – This tag is used to signify shots taken on an iPhone.

#iphoneonly – And this is a little dig at Android users.

#iphonesia – This one is used by iPhone-owning Instagrammers in Indonesia and East Asia.

#instamood – This means the photo is reflective of your mood.

#nofilter – A term that implies the shot was taken without an Instagram filter.

#foodporn – This tag is applied to various pictures of food.

#cloudporn – This one is applied to random cloud shots (see above). 

#100likes #500likes – Instagram users apply these tags to their 100th, 500th, 1,000th shot, and so on.

#flashbackfriday – Instagrammers use this tag to show photos from the past.

#instagood – Photos with these tags are ones in which the Instagrammer is particularly proud.

#tweegram – This is a tag employed by those who use the popular Tweegram iPhone app that lets you put text inside photos.

Any others you’d like to add? Or are there any hashtags that weren’t mentioned you’d like to ask about?

Arik Hanson is principal of ACH Communications. He blogs at Communications Conversations, where a version of this article originally appeared.